Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4d0797edef9194…

MALICIOUS

PDF

65.7 KB Created: 2020-11-11 04:52:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 69a10dfa336493ca94702f74433c8cc7 SHA-1: d9aa6f165c92b067c04ab22e4fb30befe2b1484d SHA-256: bf4d0797edef919425b109542cb9d5edf99434513578bab5f2a9eb828cf92ea5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating it is part of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

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://trafffi.ru/123?keyword=uzbek+kino+2020+yil PDF link annotation
    • https://gulawunobuxag.weebly.com/uploads/1/3/4/6/134627092/mejuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369664/normal_5f8beb9c542db.pdfIn PDF document text
    • https://buzijivugaza.weebly.com/uploads/1/3/4/7/134709386/9002825.pdfIn PDF document text
    • https://xabogiseduwa.weebly.com/uploads/1/3/4/7/134717421/28133b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f86ffc535d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_5f9f59d119031.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/pefifuw_bejejene_fitifotofo_fimalidep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417406/normal_5f9ba0c768007.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/3677886.pdfIn PDF document text
    • https://kawigijutugin.weebly.com/uploads/1/3/4/3/134351661/mapevi-folisepupum-supikoje-gibixotokowubog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390330/normal_5f9a24ddb88a9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mefovu/gcss-army_intermediate_navigation_test_answer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8ba6d4-1993-4582-9786-c05b4c29a534/fizaresuwotolubadal.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/lufebutexixorovupirutena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e2c7a01-dcc5-42a9-bc81-e21d2b426c42/wifiwudugufaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6435070b-ab6e-42cb-93d1-33fdd852cf09/dizodosep.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_off0000bca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA3 4816 bytes
SHA-256: 621397f99f80aa94cade0e00190d2833ab601d6438568115c52643c0fdad4038
font_01_sfnt_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 14164 bytes
SHA-256: 496e22049f73245d91ab8294ce1609d780fe790a33a61555477d9efed604fdfc

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