Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95fa9d569d22830…

MALICIOUS

PDF

74.2 KB Created: 2021-03-01 17:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 15d4296c76b38db0f510ba7450f0dd9a SHA-1: bf542d694b0dc49ad417fb425911a0e124078919 SHA-256: b95fa9d569d2283046623fd31921a3544645496f4a7e1cb7225a1ff56838d26c
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, indicating a link farm designed to direct users to various websites. The presence of a critical heuristic for PDF SEO link farming and ClamAV detection as Pdf.Phishing.Trojan suggests a malicious intent to redirect users, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest an attempt to exploit users through external resources.

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://bologen.ru/wix?keyword=passport+to+manhood PDF link annotation
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/5650386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401555/normal_603a467a5b5ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_6030333d2a7ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_602f9ef64daa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496389/normal_5fc7f1e2cc1c7.pdfIn PDF document text
    • https://cdn.sqhk.co/temejikowewa/NjjCjeW/pastel_blue_tie_dye_background.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/what_is_simple_keywords.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481515/normal_602ebd20917b3.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/vibakumopamu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_603b5df1c3bac.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/zuwofatinafategaji.pdfIn PDF document text
    • https://ganaletikuwefe.weebly.com/uploads/1/3/4/3/134306697/8336107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446638/normal_5ffe82cbd6ac5.pdfIn PDF document text
    • http://vofufime.mypressonline.com/xefudofopemen.pdfIn PDF document text
    • https://diwoxine.weebly.com/uploads/1/3/1/8/131872021/jesuzuxelol_texaso_tizukej_fulofobevove.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/sirunula.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_off0000e6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B8 5168 bytes
SHA-256: a2f2dc11c603fb60456e0017db7571304f2a65f17ee9d1c0de21e2cd5a883a99
font_01_sfnt_off0000f81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81C 10548 bytes
SHA-256: a163f66b8001ee9aee5fd9db107e5e421bb15395d3416c7d130e2882de9dfd46

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