Malicious PDF — malware analysis report

Static analysis result for SHA-256 e612b2fe97a51118…

MALICIOUS

PDF

79.8 KB Created: 2021-03-23 15:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d22909c71453bb3e32c6681bc8b601e SHA-1: d496b8a307611bf8e6affd1b59a26bac55fe2b20 SHA-256: e612b2fe97a51118df2b2714668a76646715893a017c501c7520079311c2c675
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a link farm, and is detected as malicious by ClamAV and an ML classifier. The document body, though partially obfuscated, suggests a lure related to financial software (QuickBooks) to direct users to malicious URLs. While no scripts were explicitly extracted, the PDF structure and extensive URL usage indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=how+to+record+installment+sale+in+quickbooks
    • https://cdn-cms.f-static.net/uploads/4381297/normal_601b986356bdd.pdf
    • https://cdn.sqhk.co/luxixumogez/hfhawgc/3073724795.pdf
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/kowupexowiwij.pdf
    • https://cdn.sqhk.co/furafurume/7WAFYSe/cartoon_tv_channels_live_streaming.pdf
    • https://cdn.sqhk.co/sebazisop/ggfZqgj/descargar_star_wars_galaxy_of_heroes_para_pc.pdf
    • https://ruxakadun.weebly.com/uploads/1/3/0/7/130739963/rapemodozi.pdf
    • https://cdn-cms.f-static.net/uploads/4426409/normal_6058f635bb661.pdf
    • https://nenawopoweso.weebly.com/uploads/1/3/1/4/131406478/golegaxule.pdf
    • http://vabademajelid.iblogger.org/treatment_for_auditory_hallucinations_in_the_elderly.pdf
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/8917e.pdf
    • https://cdn.sqhk.co/towevefizub/dRfQje7/zunolap.pdf
    • http://guwaxata.iblogger.org/nekajoj.pdf
    • https://static.s123-cdn-static.com/uploads/4445890/normal_5ff5615e2a934.pdf
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/6b520.pdf
    • https://cdn.sqhk.co/wujakegu/jeGTs5b/magic_school_story_apk_unlimited.pdf
    • https://cdn.sqhk.co/voxobidivel/c4jibMZ/mewelo.pdf
    • https://cdn.sqhk.co/tokofape/fjgx9gj/41634941863.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jerokiguwipifo.rf.gd/2744492903.pdf
    • http://babematalal.epizy.com/sitajadogovufude.pdf
    • http://xufizup.rf.gd/boy_scout_store_tulsa_oklahoma.pdf
    • http://zatajuvezutulo.rf.gd/78063467235.pdf
    • http://solukirakologi.epizy.com/82615273709.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ac.bin
65b77f72cfa9d35c5c396c3d6457ec4d714647ed121ba5a806822b2fbbff7bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 5468 bytes
font_01_sfnt_off00010c39.bin
6c2ccd42838e26e4ee80f3f1948e760dc034a78e3406d4a03e5f2ffcdfc53348		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C39 11004 bytes

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