Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ef81f600bf5ebd…

MALICIOUS

PDF

74.0 KB Created: 2021-06-14 11:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d51f73fc02c5ac6979107b7424ab9df4 SHA-1: 24a44324548b79bc8731ec56ce43a57411752583 SHA-256: d4ef81f600bf5ebdb03f0c90739ecaba3cff8095e2fd4a13760e4b1515a42555
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/pbw?utm_term=convert+word+to+bibtex PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365560/normal_6001018acf716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449411/normal_60397911c1a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_601e521ce462b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavudexote.pbworks.com/w/file/fetch/144747498/voxubo.pdfIn PDF document text
    • http://latojelu.pbworks.com/w/file/fetch/145174842/wufolafanuxuju.pdfIn PDF document text
    • http://lebinowurut.pbworks.com/w/file/fetch/144821133/are_apollo_dirt_bikes_any_good.pdfIn PDF document text
    • http://tagexoba.pbworks.com/f/fantastic_beasts_1_streaming.pdfIn PDF document text
    • http://fumagefad.pbworks.com/w/file/fetch/145174680/govinda_ki_film.pdfIn PDF document text
    • http://ririgifavem.pbworks.com/f/forza_horizon_2_soundtrack_youtube.pdfIn PDF document text
    • http://mutoteja.pbworks.com/w/file/fetch/144502305/fundamentals_of_futures_and_options_markets_download.pdfIn PDF document text
    • http://bulezesikur.pbworks.com/f/claim_of_policy_essay_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90df54d9-2b37-4979-9b44-ac6693e09259/how_to_train_mental_toughness_in_sports.pdfIn PDF document text
    • http://pojaweku.pbworks.com/w/file/fetch/144452880/asure_id_7_express_crack.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/how_to_replace_oven_igniter_ge_profile.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/w/file/fetch/144758910/96385561418.pdfIn PDF document text
    • http://wiliser.pbworks.com/f/oxford_bookworms_stage_6_free_download.pdfIn PDF document text
    • http://gabumur.pbworks.com/w/file/fetch/144493713/90498378873.pdfIn PDF document text
    • http://bezawagiga.pbworks.com/w/file/fetch/144669804/95301152689.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144421137/velidijipobavevuf.pdfIn PDF document text
    • http://zezimin.pbworks.com/w/file/fetch/144670461/42592805937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b4885de-5aec-4cf9-8c49-e2d468352bcb/g_shock_ga100b.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f839b524-f082-4973-8224-6f1c3f39c788/64236983428.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 4664 bytes
SHA-256: 40ed15d0f9b888f7302462f1b07f26e289f47c9b417ad0d9bf33f39e3ba65682
font_01_sfnt_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 10896 bytes
SHA-256: 7a1d79cf9be2ca75bebde851b4e4bfcc0037b16f10f308a7a9ca1f989a5001aa