Malicious PDF — malware analysis report

Static analysis result for SHA-256 933844732a4fc3f9…

MALICIOUS

PDF

115.9 KB Created: 2021-01-21 22:26:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 11584b8270b96b4ed50368769d166d6a SHA-1: d0f5d5b0d4657c22b3de7fe233f283cbb181a717 SHA-256: 933844732a4fc3f9d1a5a4b83426f29a42b3d1d18e5614d222ddc4b7c0d10705
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF containing multiple embedded URLs, many of which point to disposable hosting or known redirectors. Heuristics indicate it's a malicious redirector and a link farm, suggesting its primary purpose is to lure users to malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=sukhmani+sahib+path+english In PDF document text
    • http://kuxogajow.iblogger.org/jewellery_website_templates_psd_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5feb96873f245.pdfIn PDF document text
    • https://site-1174576.mozfiles.com/files/1174576/35410867248.pdfIn PDF document text
    • http://zirosax.iblogger.org/yuketen_guide_boots.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/mxNjjie/best_free_call_blocker_for_android_2019.pdfIn PDF document text
    • https://site-1171526.mozfiles.com/files/1171526/cafe_games_online_facebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_5fddcac385fe7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449397/normal_5fcfb089043c5.pdfIn PDF document text
    • https://site-1171599.mozfiles.com/files/1171599/tixaduxixokori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://joretewad.epizy.com/tigasup.pdfIn PDF document text
    • http://tufukupetateto.epizy.com/cat_exam_full_form.pdfIn PDF document text
    • http://pazipinabobon.epizy.com/newivefawebosabizuzazis.pdfIn PDF document text
    • http://zalezir.epizy.com/20336969043.pdfIn PDF document text
    • http://bakotege.rf.gd/15914439168.pdfIn PDF document text
    • http://jerovewoxisabu.epizy.com/gabipezekitime.pdfIn PDF document text
    • http://xenemusexo.epizy.com/9866699527.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_off00018dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DAE 5444 bytes
SHA-256: 6dbbaf4a1afd66b19a8e2d9b466cf7bc2148ea22b69e64a1b7377214a184203c
font_01_sfnt_off0001a007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A007 9960 bytes
SHA-256: e105f030e87eb1752f510f478da9b7ab6d450853936f10a09bc5488bcff12743

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