Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3707950d618209…

MALICIOUS

PDF

80.9 KB Created: 2021-03-23 11:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 61baca0e583732cef5cdfdb71c230089 SHA-1: d25d011c11e4a29081ad86ca6663256a127a5050 SHA-256: 6e3707950d618209619cbf1c9808379b53f26bca7ef8a7559a29589957c0cc1b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting or unknown domains, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and external links are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/wix?keyword=west+virginia+all+state+orchestra PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473064/normal_601b12c494a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464724/normal_605550eac1828.pdfIn PDF document text
    • https://telozigigozato.weebly.com/uploads/1/3/4/3/134310186/mukurezogi-bogurugavagor-dixafefos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_604fc98d3e9b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379610/normal_6042c3c252378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412773/normal_602c7fe3797d2.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/lepavafefuduvafitowi0wdw3.pdfIn PDF document text
    • https://dalosetog.weebly.com/uploads/1/3/1/4/131412235/594846.pdfIn PDF document text
    • http://moresukko.ru/craftsman_lt2000_lower_drive_belt_diagram8z0xp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_602d55959d2cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448115/normal_604e41a1e7d9b.pdfIn PDF document text
    • http://vsedlyatebya.xyz/tivenalanutifaduw0v6l9.pdfIn PDF document text
    • http://demask.space/cfa_curriculum_errata8d5vh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_ffe09181d3c9456cb6bd7ff36f24d0ed.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_83020f66c36d4d48b184a98250b341f8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomuper/o_que_e_celula_caliciforme.pdfIn PDF document text
    • https://s3.amazonaws.com/debiwelof/how_to_make_cinnamon_rolls_on_a_pizzazz.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_60fdad07447445caa6fcb7bbfb007aa1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/ossiarch_bonereapers.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_1c2427e020fd45dc9ed5d7f5b7970a13.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/bleach_brockhampton_piano_sheet_music.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_off0000fc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC80 5136 bytes
SHA-256: cb76ed25762b2d21a13e446b9ba99ba04f764d82924d9945fa6da0c662a360f2
font_01_sfnt_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 11432 bytes
SHA-256: 37805fd43a22be0293916bf36b6e02e5b8cda69bf914a786157928fe081cfabd