Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10b2271fac4ff82…

MALICIOUS

PDF

81.0 KB Created: 2021-06-04 21:38:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7bff2bbd0791433050f23261b73d79e4 SHA-1: 68d8969b52862e055aaeb6ee4ffe46e3bac5b52b SHA-256: a10b2271fac4ff82daa8aee0c41e805a3cf24b4b18f451f0fa3f6d5d8fb52a17
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'infrive.ru', suggesting a phishing or malware distribution attempt. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://infrive.ru/pbw?utm_term=problemas+resueltos+de+maximo+comun+divisor+y+minimo+comun+multiplo+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426062/normal_601816b0acbc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_60064aec03bbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_6034edbc762b8.pdfIn PDF document text
    • https://gozulisob.weebly.com/uploads/1/3/4/0/134012313/koruzodig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_606b9cf635944.pdfIn PDF document text
    • https://sonunupenoxomo.weebly.com/uploads/1/3/3/9/133986361/januga_mivixaxe_suvewezak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_60b873071917f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383131/normal_5fc66ecdc0abf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490738/normal_6066080b8c635.pdfIn PDF document text
    • https://panulozeti.weebly.com/uploads/1/3/5/3/135351273/gugipera.pdfIn PDF document text
    • https://tilemutafadat.weebly.com/uploads/1/3/1/8/131856023/d49c65c09c9485.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375891/normal_5fdecc731edba.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/nomujo.pdfIn PDF document text
    • https://regujume.weebly.com/uploads/1/3/4/3/134339948/gelekeboxosugo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410000/normal_5fe1032152c41.pdfIn PDF document text
    • https://ruzetutenu.weebly.com/uploads/1/3/4/6/134633181/nemujegut.pdfIn PDF document text
    • https://ximixejolulozo.weebly.com/uploads/1/3/4/3/134351986/f451f82b55f2.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
    • http://mavujeridolu.pbworks.com/w/file/fetch/144509748/possessive_adjectives_or_subject_pronouns_exercises.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/sisematiravalewu.pdfIn PDF document text
    • http://mukibilevejo.pbworks.com/f/javot.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/arapa_ders_kitab_cevaplar_6.snf_evrensel_iletiim_yaynlar.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/disadvantages_of_the_burren.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144513429/43442772669.pdfIn PDF document text
    • http://fevosezew.pbworks.com/w/file/fetch/144440382/whatsapp_apk_2020_descargar_gratis_para_android_ultima_version.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/w/file/fetch/144565776/83201282466.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144507057/fesazasosodavavobelased.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_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 5556 bytes
SHA-256: ff927ee53277530da429ab021d516966fc3fe4ac2b6642caba8f2fe6567c0c89
font_01_sfnt_off0000fd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4A 12576 bytes
SHA-256: 610aacd6fdf8f381888f9157ed72157548eb0d47e566e73dd670ad21a0312b9c
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c