Malicious PDF — malware analysis report

Static analysis result for SHA-256 f308208709bb6480…

MALICIOUS

PDF

73.2 KB Created: 2021-04-02 18:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 43243f101418a2b00e2029a61b6d31d0 SHA-1: bd641786c567554af5bd0f212c3f86c9766248c7 SHA-256: f308208709bb6480de2f56987866dacfc57e34782202b4e119e1ee594caf53d0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dugedepap.ru/123?utm_term=jenkins+embed+html+report+in+email PDF link annotation
    • http://songkfrk.site/862476997785lr4t.pdfIn PDF document text
    • http://oblakova.ru/las_cronicas_de_narnia_46rtv0.pdfIn PDF document text
    • http://xozonline.ru/sizunelenerudafubivukud1ro6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_45dbce568f8040509305970802b7a86e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b08124-fe08-49bc-8b1b-d15c1cf49aba/40939622419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fee3bc2-c9ad-407d-88c7-3615baffb600/good_interview_questions_to_ask_a_job_candidate.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_9110cd070e144cbf9454f58c9eb8e486.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/21266ea8-7b02-4a26-8a6e-1ef9c436a663/96370807685.pdfIn PDF document text
    • https://736f3f86-ac4a-4d06-be6b-3320275ea8ee.filesusr.com/ugd/cd27d0_2816bff4e26445419728f7b17e6a1365.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/222e28af-e9a8-4ca1-aeb1-b688691f1689/how_much_does_it_cost_to_replace_a_furnace_in_a_mobile_home.pdfIn PDF document text
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_4cd8396cc0d047aea9bc066a9750b320.pdf?index=trueIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_844b66992b5e41cbb61c4ed8b5276eba.pdf?index=trueIn PDF document text
    • https://2108ee29-f41f-4224-afb3-8e24ca2f7712.filesusr.com/ugd/279473_e898a36ce87943688479a21575996f7f.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_f42a7a0dfc264c449796c5c6a77f6a03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cdb9108-0e0c-4e01-9b5c-edfcf23be163/what_are_the_features_of_a_descriptive_text.pdfIn PDF document text
    • https://21319658-e817-4d6a-846f-872ccfe0f0c2.filesusr.com/ugd/982af2_3c9b0fde290e449fa57d45639f6e05eb.pdf?index=trueIn PDF document text
    • https://a1f0096d-76f5-425c-b826-5ccbd312c1bc.filesusr.com/ugd/8f8c07_da5542ffb98e4b44af8ecec7457f5746.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea0854e1-adb5-468e-93df-cf351be4c3a8/can_you_use_stranded_wire_for_underground_dog_fence.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_861000c7a6ab4099be67cca2f7119117.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c284f88-a2df-4a9f-b57b-761c5df077f5/phrasal_verbs_in_english_language.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_922c6d9cd9a24e07a30d4bd2a88eb442.pdf?index=trueIn PDF document text
    • https://7605d98d-8b17-4a41-9383-f5c8d5af9bcc.filesusr.com/ugd/2bed4c_44933518d71f4bc8b62ba167f14d66c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05b77a1f-f0a9-4049-851b-547bfafd25f9/zifuvi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89327aa4-a3c9-4ae5-87ae-73eb4669bfb2/zekuwoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abb6c48-5f40-4916-b8c6-f6dfab34a305/tokinugapexoxuwe.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_7107cdf348c3460f8a9523d35a5ceba6.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 5392 bytes
SHA-256: 0b49e6c40655192d585dae7fa69f9eff50a00d6086e20ce3c084bcba29e7e4a5
font_01_sfnt_off0000f2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F3 10160 bytes
SHA-256: 4e1841249f3f3a3b6bfbb069416026e01e4f2e2626b2394cff4e2bd0e9f9f4bf

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