Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f8a080fbfe5722…

MALICIOUS

PDF

76.4 KB Created: 2021-06-10 19:00:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a03327d8fe52c9fc9502b6c85c44782a SHA-1: 93f0828652fccb6c8722ca9a6c1a20a9c9e10a26 SHA-256: 33f8a080fbfe5722feee8cc98ba22d70adb8e44a0153ce41bf6920a2420df186
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 0.9953

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://huntic.ru/pbw?utm_term=chapter+2+chemistry+class+11+notes+pdf PDF link annotation
    • https://dizugupixaxagoj.weebly.com/uploads/1/3/4/4/134440249/318601.pdfIn PDF document text
    • https://nivejuva.weebly.com/uploads/1/3/4/7/134713874/bepatokirifikuluja.pdfIn PDF document text
    • https://sekoxakukajafal.weebly.com/uploads/1/3/4/7/134705290/4147469.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_606b9cc79b9d1.pdfIn PDF document text
    • https://bujetukojijem.weebly.com/uploads/1/3/4/8/134875379/1922424.pdfIn PDF document text
    • https://jabexigiji.weebly.com/uploads/1/3/2/6/132695602/3513154.pdfIn PDF document text
    • https://malibuvebejonab.weebly.com/uploads/1/3/4/5/134524684/nomagosatezolatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_604a440beeaf0.pdfIn PDF document text
    • https://juludonidodag.weebly.com/uploads/1/3/4/7/134706402/kixebewelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_6047315701301.pdfIn PDF document text
    • https://lifuregetarip.weebly.com/uploads/1/3/4/3/134384561/budipapop_bojoni_dutumepaxow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471682/normal_5fcea262c51e5.pdfIn PDF document text
    • https://lirigudufov.weebly.com/uploads/1/3/0/7/130776684/nemamakolod.pdfIn PDF document text
    • https://sanufelileme.weebly.com/uploads/1/3/0/7/130775971/03c4f19da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_6054f3d72718a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jabodawo.pbworks.com/w/file/fetch/144609207/bobulike.pdfIn PDF document text
    • http://bunemirudezo.pbworks.com/w/file/fetch/144790137/how_to_connect_mg2522_to_wifi.pdfIn PDF document text
    • http://pijipusap.pbworks.com/w/file/fetch/144472842/monsters_inc_scare_island_pc_iso.pdfIn PDF document text
    • http://negaboxa.pbworks.com/w/file/fetch/144453336/manual_for_ge_profile_dishwasher.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144427908/achyutam_keshavam_radha_krishna_serial_song_mp3_download_pagalworld.pdfIn PDF document text
    • http://veweran.pbworks.com/f/nutramigen_powder_mixing_instructions.pdfIn PDF document text
    • http://sipibujewadu.pbworks.com/w/file/fetch/144513681/filifovomazusibewenotu.pdfIn PDF document text
    • http://medodadepud.pbworks.com/w/file/fetch/144720471/is_sea_of_thieves_free_to_play_online.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144483717/how_to_connect_jbl_soundbar_to_tv_using_aux.pdfIn PDF document text
    • http://xugatun.pbworks.com/f/xepevemixaxigikugaw.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144425343/wubamad.pdfIn PDF document text
    • http://pivumiraw.pbworks.com/w/file/fetch/144835386/50417969926.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/w/file/fetch/144681411/4762738534.pdfIn PDF document text
    • http://sezipakupuw.pbworks.com/f/harry_potter_2_gbc.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_off0000ecb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB3 5588 bytes
SHA-256: f8633bd0fa6c9e3d4ac42455642704102de01421f498ec4974e6e5c6ce9f6978
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 10636 bytes
SHA-256: cc63bae643a60783afa31967dcd43f71f1240b25173f38e0762ab6647043c63a