Malicious PDF — malware analysis report

Static analysis result for SHA-256 25090c8878ead418…

MALICIOUS

PDF

78.3 KB Created: 2021-06-01 05:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cf9468be453382b58186a1f9f65af41c SHA-1: a8c8b703d9fe137a3c3842ce3f2b78fa15c766bb SHA-256: 25090c8878ead4188c38d33332a0ba85014f4cb5e9d1dea7f93172d75168a840
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent link pointing to 'oniceh.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, indicates it is presented as a 'Calendario colombia 2020 con festivos pdf', a common lure for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/pbw?utm_term=calendario+colombia+2020+con+festivos+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390328/normal_6059d9ff68e7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427313/normal_6033d38a8e87d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5ff92e69b30c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379602/normal_5fe76ee793f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_6063c8df8aae5.pdfIn PDF document text
    • https://mujurusema.weebly.com/uploads/1/3/4/8/134846640/5669140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_604fea1a5dcff.pdfIn PDF document text
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/bilumemadekab-rexaserelex-monuwuwabodiw-pumaw.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/5b765.pdfIn PDF document text
    • https://nufosizusom.weebly.com/uploads/1/3/4/6/134619592/d1e616fe.pdfIn PDF document text
    • https://turezizudowan.weebly.com/uploads/1/3/1/6/131606253/lozukemadigo_tunifofawevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392209/normal_5fff5bd6ea2b1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391000/normal_5fed802a51e41.pdfIn PDF document text
    • https://rowimunikak.weebly.com/uploads/1/3/5/3/135346477/gejinaseji-neroguroga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393016/normal_5fe272c5cb68b.pdfIn PDF document text
    • https://tiritezolodimim.weebly.com/uploads/1/3/4/7/134743729/9776181.pdfIn PDF document text
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/kokagemesunodi-buzuxiw-jafolosi-lubirumagip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijozuzapusa.pbworks.com/f/51783440720.pdfIn PDF document text
    • http://tubekikewabi.pbworks.com/w/file/fetch/144439992/enfoque_cognitivo_psicologia.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144413865/free_instagram_followers_app_2019.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144418101/what_is_inner_transition_metals.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/nobutirur.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/download_factory_inc_mod_apk_android_10.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/w/file/fetch/144431637/dynamite_recruitment_timesheet.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_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 5680 bytes
SHA-256: 5ffe972afe44bde86a861a281b3bdd7d82bcc850bef1436c2b50da2f6ed1584e
font_01_sfnt_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 12080 bytes
SHA-256: 867b33aeed63d17054f00f1792ef99315a9233be6b55bbce02a303c625df7660