Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9bdb3cfa8137be…

MALICIOUS

PDF

84.3 KB Created: 2021-04-18 04:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8810548fd0e1df9575967432bb6a2b7c SHA-1: 58c871b6f766fe5d5b4962d5e899a4f66736808d SHA-256: cc9bdb3cfa8137be81ccb68d5a162349fbcf6b909eb760d75f92c69d6ff12bd2
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to malicious or spam content. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/strik?utm_term=bertrand+russell+atheist+quotes PDF link annotation
    • https://cdn.sqhk.co/vuvapolaxaj/Vifgjjj/dofawimudubozojasavit.pdfIn PDF document text
    • http://idealslimitalia-ufficiale.site/tree_of_life_pendant_silverho12r.pdfIn PDF document text
    • https://cdn.sqhk.co/birifoneboj/gjfgdHy/midokokutegonipuvogo.pdfIn PDF document text
    • https://patobozojewe.weebly.com/uploads/1/3/4/8/134863794/lobaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/pejibuti/XQqNjif/pronunciation_guide_for_irish_names.pdfIn PDF document text
    • https://cdn.sqhk.co/zumumolebajo/2mZfig5/91318242086.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/hfH9agh/96988917445.pdfIn PDF document text
    • https://nilukosezaxed.weebly.com/uploads/1/3/0/8/130814529/6241553.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/xEidjgl/xenokalujug.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/ijjjfja/290890131.pdfIn PDF document text
    • https://zatuzura.weebly.com/uploads/1/3/1/4/131453499/9c808526cb0.pdfIn PDF document text
    • https://fabuduviwanor.weebly.com/uploads/1/3/4/7/134739750/5194051.pdfIn PDF document text
    • http://legendarycraft.ru/duvituzafakuzewap9678j.pdfIn PDF document text
    • https://cdn.sqhk.co/vozupowo/ymghjcQ/20950700469.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/fRliijc/sonny_liston_son_sweden.pdfIn PDF document text
    • https://cdn.sqhk.co/mejapevelu/A22Hhe0/zombie_party_favor_ideas_for_bridal_shower.pdfIn PDF document text
    • https://pasojifet.weebly.com/uploads/1/3/0/7/130776368/lebufuvibadibepug.pdfIn PDF document text
    • https://cdn.sqhk.co/tosobulig/zCWEOjf/90080557836.pdfIn PDF document text
    • https://cdn.sqhk.co/wigatozaduw/gghgxjg/mnemonic_planets_order_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c889f161-f052-40f9-8aaf-a895233a5e02/sozogesolutovovipat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32b3290-a6a3-4718-99a8-edea2ad83889/what_is_the_correct_definition_of_triage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/222ce6a3-d31b-42a8-8809-2c59c87c6e64/husky_445_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4cf4170-5b0a-4f4f-a3bc-f4cf9809c1f4/jobazalevebadode.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 4972 bytes
SHA-256: d92f1e0b67e7c7e54268edc62e7ef73879930c9e54dc3164d5b7e0e373bfb0d5
font_01_sfnt_off000111ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AE 10824 bytes
SHA-256: 7c93c4c75dc2df5436f638fd7e37a3790d6d353dd5944facd29776c0bfc69f4e
font_02_sfnt_off0001368a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1368A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230