Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b15cb47a750dae…

MALICIOUS

PDF

76.7 KB Created: 2021-02-12 10:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 99221734d381b51ab5e6129f4ce36ac8 SHA-1: defc38609ee60c2133380bc0df0e7e4e0cc18314 SHA-256: b1b15cb47a750dae427b79012043c920ced1c2602eb7c143d2bf3668cbfb802f
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 pointing to link farms hosted on disposable domains, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be related to interview questions, serving as a lure.

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://seumenha.ru/wix?keyword=bgp+attributes+interview+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388839/normal_60123e6e7b9ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383929/normal_6004ad061e603.pdfIn PDF document text
    • https://jerupixudenaxi.weebly.com/uploads/1/3/1/4/131437293/9387a1.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/bITts3h/xetogurod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451033/normal_5ff1124822c20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416506/normal_6018da6ed08a5.pdfIn PDF document text
    • https://cdn.sqhk.co/bebiwamulanu/aLdie5r/super_bomberman_r_how_to_unlock_all_characters.pdfIn PDF document text
    • https://xesanojazal.weebly.com/uploads/1/3/0/9/130968931/wuduvo_kuvitok_kalixusarejogi_mudupopu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4531523/normal_5ff0f2301d64b.pdfIn PDF document text
    • https://kevititexozasen.weebly.com/uploads/1/3/2/7/132712545/6552172.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/hgVWIuZ/23113745015.pdfIn PDF document text
    • https://raxopukefafifi.weebly.com/uploads/1/3/2/6/132695755/f59a2fa342942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_5fdbe91e1aa93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jufakoxageponuz.rf.gd/17616806153.pdfIn PDF document text
    • http://vumigewinumuzi.epizy.com/binomial_expansion_example.pdfIn PDF document text
    • http://rafetomobu.rf.gd/proper_assisted_pull_up_form.pdfIn PDF document text
    • http://gosizabogabam.epizy.com/prize_draw_ballot_template.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_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 5420 bytes
SHA-256: b54ed2c67c3713591a7a619068337749b529bbdd2359d12331b19466739c65fe
font_01_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 10408 bytes
SHA-256: a7b26b30c14f27922e22c0d9ac538325a5a7776b50df1218a072c3c1a9aace33

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