Malicious PDF — malware analysis report

Static analysis result for SHA-256 838aaf3f9d8ceaba…

MALICIOUS

PDF

82.1 KB Created: 2021-02-07 21:56:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 401ad1099ea1d17bd9458e055975bdf0 SHA-1: a78872b2713996e7fd00726f3e467158200c951c SHA-256: 838aaf3f9d8ceabaa4eb08742851c10157dbea5e0006b489dfa3b8242dbe8b85
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical detection for a link farm containing numerous external URLs. The ML classifier also returned a high probability of maliciousness. The document body contains text related to smartwatches, suggesting a potential lure for phishing or SEO manipulation. The presence of many external links, some on disposable hosting, indicates a likely attempt to redirect users to malicious or spam content.

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.
  • 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://leonvi.ru/aws?utm_term=best+waterproof+smartwatch+for+android PDF link annotation
    • https://cdn.sqhk.co/risenulowo/Cijhd8l/72479068070.pdfIn PDF document text
    • http://dreabling.online/56982066711xi4b0.pdfIn PDF document text
    • https://pevexozu.weebly.com/uploads/1/3/4/8/134857768/gopagejiz-nosomejuga.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/wtgelhd/39365994894.pdfIn PDF document text
    • http://zufutefej.22web.org/62181940593.pdfIn PDF document text
    • http://maroron.22web.org/rezezozasewesigifonuluweb.pdfIn PDF document text
    • https://cdn.sqhk.co/sokodajep/bwIQWhc/94522110650.pdfIn PDF document text
    • http://kufemotobenin.66ghz.com/perfect_attendance_certificate_template_microsoft_word.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/Cgfpgga/72828110555.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/bl6kXgf/adderall_side_effects_on_pregnancy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wubonaxe.epizy.com/kanunixi.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/printable_math_worksheets_multiplying_decimals.pdfIn PDF document text
    • http://naremijex.epizy.com/zebaninuzobov.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/vipadifufigeboke.pdfIn PDF document text
    • http://puxirozenudut.rf.gd/binary_system_conversion.pdfIn PDF document text
    • http://xanunomoz.rf.gd/sopikovesifibedi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 5292 bytes
SHA-256: 7bb597cc579b07daaae2b9696185b039ca158ab922aff5d677ec6fca3f7c4951
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 10668 bytes
SHA-256: 88f66c4dddbc840f46949c0ef815b312df2b41acd162729c9bde105d7654f00f
font_02_sfnt_off00012d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D06 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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