Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbba229d99c16233…

MALICIOUS

PDF

75.1 KB Created: 2021-01-18 16:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: bc410e7271663e62307fdc8d6a372122 SHA-1: 818fbba171ffad895c4e60eac2b36f0ed06db9cb SHA-256: fbba229d99c16233be7c16c44eb6cd880aa3aba529deb436fb4f7fb9605813b1
126 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The document contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism. The primary URL, 'https://jacksth.ru/123?utm_term=is+zac+efron+gay', appears to be a lure to entice users to click through to a potentially malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/123?utm_term=is+zac+efron+gay PDF link annotation
    • https://site-1166710.mozfiles.com/files/1166710/fukijuxofad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492901/normal_5fcc28b16429b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371495/normal_5f932f9a570ce.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/ifygdie/nibugowibi.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/Gifggja/mowowenamomefujarinusomo.pdfIn PDF document text
    • https://pawiwojofidinof.weebly.com/uploads/1/3/4/4/134458390/jakomuxazep.pdfIn PDF document text
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/vabota-damidifewad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427795/normal_60058364e148e.pdfIn PDF document text
    • https://site-1177496.mozfiles.com/files/1177496/79041868568.pdfIn PDF document text
    • https://zolotamazuragif.weebly.com/uploads/1/3/2/7/132712333/3876507.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/uiaTjb5/14261632697.pdfIn PDF document text
    • https://jotogenawe.weebly.com/uploads/1/3/1/4/131406354/8065987.pdfIn PDF document text
    • https://site-1178961.mozfiles.com/files/1178961/diwamisatuzapififigazo.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/sisaxu/scooby_doo_bedding_full.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/safemotaga.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/hotstar_premium_policy.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/google_apps_at_umaryland.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_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 5108 bytes
SHA-256: a796100b5af4254423bce4acd94c9b5f2870607b573fb4924eda94aab2927c13
font_01_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 10792 bytes
SHA-256: c7b1a23bd904ec1ac913b0c4934597e14b5c69851a187fb4dc8edec62bcd518f

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