Malicious PDF — malware analysis report

Static analysis result for SHA-256 11982438b27ba518…

MALICIOUS

PDF

78.8 KB Created: 2021-04-04 13:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b2d4a93bcae2aea7dca03bf111481b5d SHA-1: 96a730f5495c458269d1ebed73cd0a8b30435ad1 SHA-256: 11982438b27ba518b521116461131afad840445c7c1d3a4adae1f2d82342b4cf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this tactic, which is often used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=ms+sql+documentation+pdf PDF link annotation
    • http://timecodes.net/noco_genius_g3500_not_charging28qnc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_60089d7070da8.pdfIn PDF document text
    • http://doworevo.22web.org/vawupapekarek.pdfIn PDF document text
    • http://bigujepu.22web.org/antonyms_exercises_worksheets.pdfIn PDF document text
    • http://newyearshop.site/how_to_start_military_dating_formatak2b1.pdfIn PDF document text
    • http://xusonawifofi.iblogger.org/ethos_pathos_logos_worksheet_answers.pdfIn PDF document text
    • http://paxawujaxoda.22web.org/best_free_admin_templates_2018.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450430/normal_6012270ec54ec.pdfIn PDF document text
    • http://storeeu.info/suddenly_seventeen_eng_sub39kq9.pdfIn PDF document text
    • http://jatamonip.iblogger.org/aerial_lift_pre-_use_inspection_form.pdfIn PDF document text
    • http://mon-cmb.best/adobe_printer_ppd_macc8id1.pdfIn PDF document text
    • http://nesobaka7.xyz/brain_it_on_physics_puzzles_onlinew91ek.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://wofevumovef.epizy.com/betorifotukavudodijoti.pdfIn PDF document text
    • http://gowatane.rf.gd/basics_of_electrical_engineering_by_bl_theraja.pdfIn PDF document text
    • http://pizobuxawefi.rf.gd/26532794969.pdfIn PDF document text
    • http://ziresam.rf.gd/gulifakulivo.pdfIn PDF document text
    • http://zudozam.epizy.com/nidegonamekamukanare.pdfIn PDF document text
    • http://juruzimezez.rf.gd/25631484304.pdfIn PDF document text
    • http://varogofef.epizy.com/500_new_sat_math_problems_arranged_by_topic_and_difficulty_level.pdfIn PDF document text
    • http://gezisekovedafow.epizy.com/37594747607.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE9 5220 bytes
SHA-256: 195bb3c8383f676ee73fe22b76549d468ebaf37106464fad24f35d11ebc29612
font_01_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10072 bytes
SHA-256: 8882ee5961c03d06c3661dd8ad0ca32c098eeabeb1952463fd9f538e757338de
font_02_sfnt_off00012000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12000 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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