Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d1c770ee405571…

MALICIOUS

PDF

83.0 KB Created: 2021-02-21 14:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a6ec3e6b275e059e413ad0db1fd82fd2 SHA-1: 2bd68e297e29ab9774dde62c0561da5d4b4869e1 SHA-256: 05d1c770ee405571f307eb4f36fde3b6d17b57fddbc4deb10d552daabc8fcb70
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ML classifiers and ClamAV, and contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The document body, though heavily obfuscated, appears to be a lure related to sewing machines, directing users to potentially malicious URLs. No scripts were extracted, but the presence of numerous external links indicates a high likelihood of directing users to further malicious content.

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 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.
  • 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://baarspo.ru/strik?utm_term=how+to+thread+a+vintage+singer+sewing+machine+bobbin PDF link annotation
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/lobubinikip_joxijegelexafa.pdfIn PDF document text
    • http://opit.space/4193396546084c3d.pdfIn PDF document text
    • https://kuruxeronujupo.weebly.com/uploads/1/3/4/4/134477992/xekajuz.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/jiCifXg/kejadosu.pdfIn PDF document text
    • https://rawafutaxudux.weebly.com/uploads/1/3/4/0/134041345/1501646.pdfIn PDF document text
    • https://sotipazokelaxat.weebly.com/uploads/1/3/2/7/132712266/8665341.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/vofesol_wufofodik_xaxifuzudaw.pdfIn PDF document text
    • https://cdn.sqhk.co/jefulajidi/jHKnpjd/24380911059.pdfIn PDF document text
    • https://popagupo.weebly.com/uploads/1/3/1/4/131407300/lexaxigutodasukaw.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/gawanetaxetijo.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/bovenotojitowe/35166680432.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/39577828522.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/wow_archaeology_achievement_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/radio_merit_badge_pamphlet_download.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_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 5572 bytes
SHA-256: 073ac81350ef1a51cb1bd46731f11b0fd359bccd24692723bf3d32cd902bdaff
font_01_sfnt_off00011945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11945 10960 bytes
SHA-256: ff90277bb1420e53a86d7966c97127ad318d724143103e38a6dbad9130b6a6ab

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