Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b303f6740cc3a1c…

MALICIOUS

PDF

72.0 KB Created: 2020-11-12 20:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cbf3d4f403d7b2eba273421bc33bee5a SHA-1: d757053155edc11a8040acdee9388fc3c87e4440 SHA-256: 7b303f6740cc3a1ceb203f5a342269cb80271cfcea2d7e5ae011b90c14c0411e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafffi.ru/123?utm_term=big+joe+milano+bean+bag+chair+review PDF link annotation
    • https://defoxili.weebly.com/uploads/1/3/4/5/134527702/sunidazap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/842fbe50-6ea8-4ed6-be53-42bb929244e4/jewutejawekasusuga.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/long_horse_sound.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41956afd-bde9-4b10-9a23-ffe73c5713ae/20574387682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a9ec53b-4a30-47ce-a45b-34d5711a127c/60131818250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41310a27-36a4-47df-8acf-9b9e34b6037c/pisinisadubipew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd2196c-246d-40b7-844a-2b9dcbd338fd/viwetibiweg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2122ff5-7a31-4735-9310-d30de2986a57/nejarelopufeniraped.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/tokigaxajanujamid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/991e5725-68fd-44a2-8b80-ba9cab1c138f/dozebamizufawowibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a180c35-2707-49de-943f-0e74b26f722e/apk_google_chrome_pc.pdfIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD119 5452 bytes
SHA-256: f32f9f85da73c77247f427f942eb11480eb75ed1d01a063ffd1b8e2834307d94
font_01_sfnt_off0000e38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38F 3720 bytes
SHA-256: 40ef96da86b6123d577d475be460de15c41b9ca7393a8e650be4e9942aa3c64b
font_02_sfnt_off0000eef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 10744 bytes
SHA-256: ae2bdee031b04ab4038f02135cc096dd3bb5f7bb13b7876644b8602b3fc42a41

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