Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb5b2a1e1f60687…

MALICIOUS

PDF

69.2 KB Created: 2021-03-02 06:48:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 7ef898629a0bfb00ab6c5796cbf9370c SHA-1: 5eed2b39972e3445a9a7fa79668a0c3a758cf5d3 SHA-256: 5cb5b2a1e1f60687264dd5872e167a635fc2457432064ecd6550475aff06f4eb
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. One of the primary external links is to 'mezovuduw.ru/strik', which is likely a phishing or malware distribution URL. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of numerous external links and the ML/ClamAV detections strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mezovuduw.ru/strik?utm_term=g-shock+mudman+strap+adapter PDF link annotation
    • https://jiromozuno.weebly.com/uploads/1/3/5/3/135387519/2107611.pdfIn PDF document text
    • https://wozijosetat.weebly.com/uploads/1/3/1/4/131407158/kaniwanedamudex.pdfIn PDF document text
    • https://vudulami.weebly.com/uploads/1/3/5/9/135964857/moxituboroxixol_tumunen_xitike.pdfIn PDF document text
    • https://cdn.sqhk.co/mofokamibe/hfNhh7p/40654606493.pdfIn PDF document text
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/savewexamadu_goduvenu.pdfIn PDF document text
    • https://zulozuger.weebly.com/uploads/1/3/5/3/135310252/fajafevesoxaxu_danemuvave.pdfIn PDF document text
    • https://girowotejetut.weebly.com/uploads/1/3/1/4/131406843/rulula-zidiwuponexi.pdfIn PDF document text
    • https://cdn.sqhk.co/pomiwuximu/jiighjb/27563279103.pdfIn PDF document text
    • https://riwaxetonebena.weebly.com/uploads/1/3/4/3/134363930/f0fbc214674db.pdfIn PDF document text
    • https://cdn.sqhk.co/xefilelo/6hejjji/tepop.pdfIn PDF document text
    • https://nibonitet.weebly.com/uploads/1/3/0/7/130776737/wusop.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/WhjehcL/10627597313.pdfIn PDF document text
    • https://cdn.sqhk.co/nugilatunu/gjpggj4/avatar_maker_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/gPjjjbS/vemidaniniriveloweru.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/zerejibixupav/livestock_farm_management.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/charsequence_android_strings.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/29804615188.pdfIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/adobe_illustrator_font.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/68993155918.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_off0000cd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD99 5408 bytes
SHA-256: eff17ec43fe1697bcefacb083bd9299dc77c44fd702b5c9f259a2109bb3c3a7a
font_01_sfnt_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 11152 bytes
SHA-256: 5bd8c198b71fd85335455c92383febb337208249dde447f68764e96d16db3780

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