Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c99503d3ec4f181…

MALICIOUS

PDF

74.8 KB Created: 2021-03-11 18:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 624b9854245fe54441ae5aaf0d86ad22 SHA-1: 1158ed4fe6483a0783201a415ef50b1f33b4008d SHA-256: 8c99503d3ec4f1811bd824727b83de030712251aa6b2d4f88f0adb9c3b44a1b8
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 0.9952

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://seumenha.ru/123?utm_term=customer+journey+template+google+slides PDF link annotation
    • https://batusuxejodasav.weebly.com/uploads/1/3/1/8/131857782/9928032.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/jchbjdX/17177598417.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/igXichi/juloxuwona.pdfIn PDF document text
    • https://cdn.sqhk.co/wemopizajazo/hiiieb9/2020_election_polls_real_clear_politics_map.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/gevuzufipase-pidofetedinute-tafosilewotexu.pdfIn PDF document text
    • https://cdn.sqhk.co/soxuvezosapa/fidahg6/mipeputivilutoxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5ff4a3af040aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_5feaeef0b9fcc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483851/normal_5fdba8a1c3190.pdfIn PDF document text
    • https://degijidugaf.weebly.com/uploads/1/3/4/8/134886203/7492f462.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/jfshjrO/shark_attacks_of_1916_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/guzoladip/hbifjfY/alien_shooter_td_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuxutagisu/fjdHYgc/bitopawumiwek.pdfIn PDF document text
    • https://wuduzavuvavazi.weebly.com/uploads/1/3/4/6/134618101/narupi.pdfIn PDF document text
    • https://gomimujexewawid.weebly.com/uploads/1/3/1/0/131070583/velelegaz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408177/normal_6008dbd0c1699.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/hggeijO/lebara_australia_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474720/normal_5fec29a45ae07.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/hixgirh/lujaxoxaladatapamogizodu.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/xalexojaxipud/pikifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8b739b8-285e-4d4b-93c6-4acc8e77654e/87767251767.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/susaxaribazena.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/tatogilavifidajowi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417b193f-faeb-4106-9251-3fd31331faa5/tojeranilunarojejapef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04b10f0-7ce9-44f9-aea8-88e8484dc53a/94401870259.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/denulegavema.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/4911719835.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_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 5360 bytes
SHA-256: ef1fb080ffe3a929e52f604c13f5c6175342b666871d97ae7c503f781aab693d
font_01_sfnt_off0000f867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF867 10716 bytes
SHA-256: ab239e9b82a5b067cc188581e04f60b9e10826112e3afdca350d0c8f7e8e4d7b