Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af879347b67bace…

MALICIOUS

PDF

79.2 KB Created: 2021-04-30 20:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bc23dc9beea9d1f4b0c57e4d920852e0 SHA-1: 53d339849bb288be24fb7acfd913f476ed682161 SHA-256: 8af879347b67bace72e3e1631a5847101abab96ac2315a988b25e742f87423cb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

Heuristics 5

  • 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.
  • 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=fluke+773+user+manual PDF link annotation
    • https://cdn.sqhk.co/ramidazumiko/cqhc5je/zombie_tsunami_promo_code_deutsch.pdfIn PDF document text
    • https://rudadikisoma.weebly.com/uploads/1/3/1/6/131606677/xebulod_tajago_dopefis_wagekalip.pdfIn PDF document text
    • https://xaxibilezulaf.weebly.com/uploads/1/3/4/0/134096047/0a8fbf2fbf.pdfIn PDF document text
    • https://vanuludegevu.weebly.com/uploads/1/3/0/7/130776818/6148622.pdfIn PDF document text
    • http://white-x.fun/chainsmokers_coldplay_something_like_this_lyricsgl73o.pdfIn PDF document text
    • https://fugebigejajifad.weebly.com/uploads/1/3/1/4/131406613/wokofukuti.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/UBjcgcA/fuzunujufepomepapafovu.pdfIn PDF document text
    • http://3203epworthcres.com/taxonomia_de_bloom_verbos_para_objetivos_especificosuo41g.pdfIn PDF document text
    • http://easylearning.space/gevikazetilu9lyow.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/haJfUqh/to_do_list_and_not_to_do_list.pdfIn PDF document text
    • https://luvodufugatese.weebly.com/uploads/1/3/4/8/134893210/ditud_tesezirulosam.pdfIn PDF document text
    • http://jushq.pro/18481643667ahkc5.pdfIn PDF document text
    • http://reduslim-shop.site/17378288526gpsz4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f882304-c604-47e0-9529-4d1307ce085a/texas_realtors_commercial_lease_agreement.pdfIn PDF document text
    • http://retomog.epizy.com/political_psychology_journal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a404a5b-1f75-49ee-8661-62199bce387d/98722052087.pdfIn PDF document text
    • http://nidotezuk.epizy.com/22519673926.pdfIn PDF document text
    • http://pezatiwasab.epizy.com/cerebral_palsy_examination.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d50e87f6-b341-44ad-906a-b8a5b1a40cdc/ukulele_basic_chords.pdfIn PDF document text
    • http://rebipilu.epizy.com/9099041990.pdfIn PDF document text
    • http://xafegewoweli.epizy.com/6723656716.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_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 5096 bytes
SHA-256: d7585bd139c8cdac8e57f537cec4eb6ffd4c37b760214f17cf10ef8ddd2d9236
font_01_sfnt_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 10916 bytes
SHA-256: 881efc735c27d5868bac37b942aa5ffeac0ed5b807c6d24668224c4831b3abb6