Malicious PDF — malware analysis report

Static analysis result for SHA-256 a288a28a84f884df…

MALICIOUS

PDF

72.2 KB Created: 2021-02-21 01:25:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 317c71b77ab5279f6993db8b91086481 SHA-1: 95a1a4ab142c95be1cc5ee87bf437bf33425927c SHA-256: a288a28a84f884df9b6c1486cd9cbe0b46a6c29c87261be638333157944d2cd2
156 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 ClamAV and an ML classifier, and contains a large number of external links. The document body, though partially corrupted, suggests a lure related to 'watch instructions' and contains a prominent URL pointing to 'jacksth.ru'. This indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://jacksth.ru/wix?keyword=armitron+40%252F8284+watch+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479715/normal_600d1c4475cf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454290/normal_5fe1394cc8bda.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/4Pihhfo/6011796747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fe41391c0e12.pdfIn PDF document text
    • http://namelesssouth.xyz/9093816459ywp0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fefc86585e0e.pdfIn PDF document text
    • https://cdn.sqhk.co/sowovupo/jagiX9V/34050134136.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/chbx0hc/retroarch_switch_gamecube_controller.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391898/normal_60049784a4a14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_602fd3833e8c8.pdfIn PDF document text
    • http://temppicture.xyz/vb6_date_format_checkgi6f0.pdfIn PDF document text
    • https://tujilebofali.weebly.com/uploads/1/3/5/3/135398949/zatopotedile-tiwozakipil-pewoterupexubab-nusosufobor.pdfIn PDF document text
    • http://figebofisekozoj.22web.org/cambiar_formato_de_letras_en_whatsapp.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/aggidMC/pivuxuvanumesovemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josegofubusem.epizy.com/15152648952.pdfIn PDF document text
    • http://jizonizop.rf.gd/89598405365.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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 5680 bytes
SHA-256: 947d74d369413508c82bb7e3f0d1a2a4852770ab06d185ec9ce2336011c5ad71
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 10996 bytes
SHA-256: fd4ebce5f59d247552f8249194d83e3e3ac047772e9c734ffb911cc2274b3697

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