Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b3b51e66d4c1e6…

MALICIOUS

PDF

70.2 KB Created: 2021-01-01 20:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 08019eb65e0e4bd10047eb2ad1e0c1c3 SHA-1: e92e30eb193ffa4b40613bfd0dd86d6ebb14ba62 SHA-256: 68b3b51e66d4c1e6316508287e8e861ff9dba5c0520a25e40ebcbbe1ea0210e7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to redirect users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://trafffe.ru/123?utm_term=poems+about+home+sweet+home PDF link annotation
    • https://cdn.sqhk.co/daxegajok/ageiiCM/fun_bowling_frame_ideas.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/3842049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481402/normal_5fd38710841d7.pdfIn PDF document text
    • https://vepiniripalur.weebly.com/uploads/1/3/4/2/134235349/fatag_kufamesefo_visuwexipal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374700/normal_5f8938b2d68e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372987/normal_5fa1a4f81ae1e.pdfIn PDF document text
    • https://merokiniperoj.weebly.com/uploads/1/3/4/6/134691049/5708696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422893/normal_5fa8ff7e3ec28.pdfIn PDF document text
    • https://xarirutufe.weebly.com/uploads/1/3/4/6/134659575/guraresafupabejubuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5fc8986caeac7.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/c0deff3e-ceac-4534-ad3a-ff57f441990c/32096372000.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/jewufowan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d1e8d54-25a5-44b1-a65e-8fe521223e5a/17473970934.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 5032 bytes
SHA-256: 599d8bafbf26c04fe169f4662a79a6126c65f7a9decd350db42d807bf416ba57
font_01_sfnt_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 10496 bytes
SHA-256: 95b38cf664ca518870ae7799e72bb45e70ce26d3f6ce890d712fdc2d50399f72

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