Malicious PDF — malware analysis report

Static analysis result for SHA-256 282067598a33a755…

MALICIOUS

PDF

82.7 KB Created: 2021-04-06 17:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 797641b2461d8558fafe67234ef1371c SHA-1: aa7d4533c4fb7b549225b063a2269fec4dd47cf6 SHA-256: 282067598a33a755c637c7b0396ed5860abec73897b6be0ab5907e6dc97ed117
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 SEO-optimized and point to potentially malicious domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for execution.

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-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://fokemale.ru/award?keyword=wellcare+texanplus+authorization+form+pdf
    • http://findssldz.xyz/what_are_the_colour_codes_of_resistorstcsyb.pdf
    • https://jeruxonoja.weebly.com/uploads/1/3/1/4/131407493/eb50e73a775.pdf
    • http://xodinazafomizi.22web.org/60610252800.pdf
    • https://cdn.sqhk.co/sepagumal/9hhiedO/59346816684.pdf
    • https://takixesa.weebly.com/uploads/1/3/4/6/134621412/wuzanepaz.pdf
    • https://cdn.sqhk.co/vitimosugu/d5YRHlJ/road_trip_quotes_pinterest.pdf
    • http://nupazoz.22web.org/bsc_biology_book_download.pdf
    • http://lp-consalt.ru/what_the_pin_emoji_meanslcdvk.pdf
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/bimukuletim-sopavorulefudav-kexetapumokok-sajojuz.pdf
    • https://cdn.sqhk.co/zojoguxuban/b7lihih/niduxuxajokax.pdf
    • http://kikawogax.iblogger.org/texivapixirizonivevol.pdf
    • https://midumelu.weebly.com/uploads/1/3/4/3/134341446/toberemaraxo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/fuwenoxuzasila/31917050173.pdf
    • https://s3.amazonaws.com/jaloto/91283653085.pdf
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_66b7405033ec46ccb97df5857512084f.pdf?index=true
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_66f880b81d174c8391ba19970d07161b.pdf?index=true
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_f2aa27dac9a0410c8a588694fb507468.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f834.bin
6f26c47d6af1a566f7128da216a098f22804f5402006792ef2a284f57d69a809		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF834 5408 bytes
font_01_sfnt_off00010a77.bin
e46c4c7a6bd68eeaab762c33bf38b4018e23400437456d9963b055264a56c382		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 10760 bytes
font_02_sfnt_off00012f37.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 4324 bytes

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