Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bae1e6ca631dece…

MALICIOUS

PDF

76.3 KB Created: 2021-04-07 23:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 066a94387b966de67c741b174f6e0531 SHA-1: 4662a195c0182e0b8b008dfa74962aa723da11d7 SHA-256: 6bae1e6ca631deced475638b5c712aae58cc74cfe2787be84e518223df548cb9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=storm+spirit+mid+guide
    • https://cdn.sqhk.co/petebeki/ad66tmB/33555291295.pdf
    • https://vonosupaxeme.weebly.com/uploads/1/3/0/7/130740497/8671733.pdf
    • https://simazilojimi.weebly.com/uploads/1/3/5/3/135345327/sapanolufaruxi.pdf
    • https://cdn.sqhk.co/bitomasijelo/QCXQSgg/fondant_cake_decoration_video_download.pdf
    • https://lidisujuv.weebly.com/uploads/1/3/4/5/134515282/delokum.pdf
    • https://cdn.sqhk.co/wosipuvetot/d7ibihO/download_hungry_shark_evolution_mod_apk_for_pc.pdf
    • https://jupedozezuwobig.weebly.com/uploads/1/3/4/0/134040413/5331548.pdf
    • https://cdn.sqhk.co/wakivugex/hgfpqCI/72486442508.pdf
    • https://jokunotewe.weebly.com/uploads/1/3/5/3/135314966/652ad3b2.pdf
    • https://ferijadupegol.weebly.com/uploads/1/3/4/7/134705138/rorokorajag.pdf
    • https://tirugisig.weebly.com/uploads/1/3/0/7/130738706/japiti.pdf
    • https://sarogixi.weebly.com/uploads/1/3/0/8/130813770/kodetugirunowidiveza.pdf
    • https://cdn.sqhk.co/robimovule/jaibjfH/division_table_1-_10_worksheet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lomuwobutuwadim.rf.gd/88546699358.pdf
    • https://s3.amazonaws.com/lomogas/80493912087.pdf
    • https://s3.amazonaws.com/polexebuj/fufilunesudulaf.pdf
    • http://mepulufe.epizy.com/51151600855.pdf
    • http://ranedugipepin.epizy.com/zozizudagaxorajut.pdf
    • http://mifefidaleriba.epizy.com/5622199156.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_off0000ef36.bin
844c95c7d49e56e65fc6d5f5b99d9d9b52653f79dce805b4e5e2b1f325ea0020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 5140 bytes
font_01_sfnt_off00010099.bin
7c1dfa3b5ebc1f359db0ac451d4d9b92c7c6bd5f815c02ddc6feee99a6dc7136		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10099 10444 bytes

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