Malicious PDF — malware analysis report

Static analysis result for SHA-256 c362876cd53ab403…

MALICIOUS

PDF

66.0 KB Created: 2021-02-15 11:40:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b11396bbeb644a1a6219ce1cdfdb3a42 SHA-1: 0a46a0833ac3ac63d9d450953d5f87089613f04f SHA-256: c362876cd53ab403f53f22cbba248487148f86468ded0a4a2c90c483367f31a8
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to be a search query, suggesting a lure to trick users into visiting malicious websites. The presence of multiple disposable domains and UTM parameters further supports a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=what+is+5+million+four+thousand+three+hundred+in+standard+form PDF link annotation
    • http://ins.expert/verejidejopubadipubbeqt.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/trivia_crack_questions_and_answers_historyigamk.pdfIn PDF document text
    • https://sobopagep.weebly.com/uploads/1/3/0/8/130873740/9b6e516cec10.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/21465491705pnh2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_600b100f2659f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_602293ae1edf8.pdfIn PDF document text
    • http://geekcods.com/context_clues_exercises_with_answersyi3u4.pdfIn PDF document text
    • http://topijakalez.22web.org/tagoj.pdfIn PDF document text
    • http://wordsidepost.top/cs_1._6_crack_indirw8286.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/6784713.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/zinat_larimokofo.pdfIn PDF document text
    • http://alex-travel.moscow/genamuv3uqw.pdfIn PDF document text
    • http://italdom.fun/wawujigorivopotoripiwe86lsd.pdfIn PDF document text
    • http://gupupokuvugal.22web.org/setanakazimetegilawugogol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/net_realizable_value_accounts_receivable_balance_sheet.pdfIn PDF document text
    • http://xezepagonozaniw.epizy.com/godefaz.pdfIn PDF document text
    • http://fufezexu.epizy.com/vupuxonomuwedovovowusal.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_off0000c0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C8 5284 bytes
SHA-256: 2fb19a7cc2eaaec3275c84fdf1590ad8ac0443aaf9bd9e532d9aa88ab1efdf38
font_01_sfnt_off0000d2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A6 11280 bytes
SHA-256: 3f6753baa4499a7d84ba9cff5a1f0ae2b73a22bdd92a4879cde99788887b7ddf

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