Malicious PDF — malware analysis report

Static analysis result for SHA-256 27882c28f25995a0…

MALICIOUS

PDF

77.1 KB Created: 2021-04-27 20:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4115082d24626cda755dc68392c58940 SHA-1: 624b1212e613357a8ef05070192842042002ef3f SHA-256: 27882c28f25995a029cfff79cc558ed1767d538635b5686be5ac8ca18542ba55
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru' which is likely the primary destination for the phishing attempt. The document body, though heavily obfuscated, suggests a lure related to printer issues, a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/strik?utm_term=why+is+my+printer+not+printing+web+pages PDF link annotation
    • http://hookup154.fun/rejifaloxanjitwl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504047/normal_5ffb91064d5dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_6003f69e6009e.pdfIn PDF document text
    • http://sait-ok.ru/girl_from_ipanema_lyrics_translationseeus.pdfIn PDF document text
    • http://bella24.xyz/rusuberenoduwekolerimenaubtia.pdfIn PDF document text
    • http://zonafuluza.iblogger.org/remizujos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460450/normal_5ffe442bd3879.pdfIn PDF document text
    • http://lami-lashes.site/475653976016yy0f.pdfIn PDF document text
    • https://.htmlpasta.comIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wilozekixed.epizy.com/biological_control_of_insects.pdfIn PDF document text
    • http://jenilonadal.rf.gd/81255245287.pdfIn PDF document text
    • http://buteboregof.epizy.com/nawesuvok.pdfIn PDF document text
    • http://gunuguduwurenog.epizy.com/bawivizawazujeto.pdfIn PDF document text
    • http://mafolizol.rf.gd/angry_birds_2_apk_2019.pdfIn PDF document text
    • http://folilef.rf.gd/game_blade_2_android_apk.pdfIn PDF document text
    • http://riniwipum.rf.gd/vosanofa.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_9b0a785d43674ac2a3e6fa9f4ce8759f.pdf?index=trueIn PDF document text
    • http://nawogov.epizy.com/camscanner_pro_cracked.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_3a78705ad98b476cb50b0d09305937a3.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_1128d2d051034c96b6ee077fa855acc9.pdf?index=trueIn PDF document text
    • http://vegenolipova.epizy.com/blackberry_pearl_8100_manual.pdfIn PDF document text
    • http://jopinewo.epizy.com/fovibog.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_88662aad0f7e411b8f7cd32dc2d48424.pdf?index=trueIn 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_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 5548 bytes
SHA-256: b326c7615b15aaf6e3c584c8cdbd591dd9c6e0f8742dd1008abd2ae71119905d
font_01_sfnt_off0001006e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006E 11160 bytes
SHA-256: 5181a588f2b489297c34c6bda76706d07fa8d2e848ccbe3c650bf0de42adf05a

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