Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d944d2e63c25c60…

MALICIOUS

PDF

82.0 KB Created: 2021-06-05 22:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6aac1dcffa710ad97b63f0ca3e8f7745 SHA-1: 7280aa891ca7902febd1c25521d8f2fd2277cfa0 SHA-256: 8d944d2e63c25c60dbb226ce71d01d4ae5b001287f74d9cc1b892ed87b5b6cfb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crysiq.ru/pbw?utm_term=can%2527t+hear+calls+unless+on+speaker+android PDF link annotation
    • https://vesepuzimimewij.weebly.com/uploads/1/3/0/7/130776402/bbb3f03329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_602b4c8a82bcf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506159/normal_605708cf3ee50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389101/normal_5fd7a0b4dff1f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461495/normal_5fc68a0dd489b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489844/normal_5ff8a9d2bcbe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403119/normal_5fd6718bc2b23.pdfIn PDF document text
    • https://vesasasafej.weebly.com/uploads/1/3/4/7/134758359/nomatofutaxotel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503035/normal_6049bbc5d7f11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454429/normal_6067777f8cfb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fd3792b8207e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495240/normal_5ff27ec1a2eb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458621/normal_603aa04df0bb6.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/fd3067d3277.pdfIn PDF document text
    • https://bewodopogogubak.weebly.com/uploads/1/3/4/8/134886142/8123146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475853/normal_606b766cb5e57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464327/normal_600671eb8f399.pdfIn PDF document text
    • https://fevapeju.weebly.com/uploads/1/3/4/4/134468187/7798328.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawaguzidatu.pbworks.com/w/file/fetch/144424053/how_to_download_fortnite_on_hp_chromebook.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/94872486610.pdfIn PDF document text
    • http://gezebal.pbworks.com/w/file/fetch/144606420/dragon_ball_xenoverse_character_creation_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8982c7b-7bc3-41a4-8a7f-ab24c5bda0e1/ballad_of_the_sad_cafe_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f67f09e2-f90f-4862-beaa-3d1b9af3aca7/93369366445.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/tajozafiloxud.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_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 5164 bytes
SHA-256: 677d5e235518e4bd5504f224f45cbbeec46f317e6d0e81372577abeae24439e2
font_01_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 11528 bytes
SHA-256: 779a40d077a5a11c699021421e4793dc51eed1c46c99cc824d2bbe4c8abbdeef