Malicious PDF — malware analysis report

Static analysis result for SHA-256 04458917f35ff11d…

MALICIOUS

PDF

82.6 KB Created: 2021-04-02 10:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 41c22c7879512eb1683815feb4ae8145 SHA-1: 054abb026e16119a22767bebc30321d936496ec0 SHA-256: 04458917f35ff11d3b1f511f2e24608dc4a1f1c4b873c247cf9df6240ef55675
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=metro+2033+redux+all+endings PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453329/normal_602ac15719e7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_604b32bde78ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494874/normal_60328d55492b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_6059af5017c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5fd2598618562.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420239/normal_60625ee5bac42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://fa5d8e44-005d-4c05-925d-ba60cb7f5023.filesusr.com/ugd/121e37_081fcf620a8a48adb1cbbec9fdfd3885.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/36390770567.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/66916076772.pdfIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_87bb2e6156164173b431316eae105ee0.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_56914fc8f3bb4c29958bb8079b8752c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/639ee050-c41e-4867-bfe2-e05befcebdd7/practice_writing_linear_functions_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50bad86-b336-43a3-9e9f-db86aed5e5d1/garudakogenove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e64922-3acc-47a0-83d1-10e980409cda/20019911580.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_e5f71910eb2345759290b8f3051b5553.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e8c59b-2e0a-4f9e-b5dd-ce13e1b491af/63156662191.pdfIn PDF document text
    • https://df256b98-640c-444d-885a-8195c7360722.filesusr.com/ugd/40b9e6_4eff4ca589c44254b63487167970de57.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_aeff5fd0cbb647e18840b8cc7948f421.pdf?index=trueIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_ad0c551a99f4457c9559cb20583ed4a3.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 5384 bytes
SHA-256: 57f3f5fe28680ede0f1d12c822e7b43c7fd1cfb5a021d20b06c40208cbda8627
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 11160 bytes
SHA-256: e26a32c616623229967ccd08d0d954c262101cb1796db86a033b700521a144ac
font_02_sfnt_off00012ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378