Malicious PDF — malware analysis report

Static analysis result for SHA-256 9618b6b7337f58c9…

MALICIOUS

PDF

74.4 KB Created: 2021-02-24 09:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba0ee454006ac29794a2519d6454249c SHA-1: 5e4544bfe381e3895c6e5ea51d8514cc46ade4b2 SHA-256: 9618b6b7337f58c9e84653da294cb173c2b06fc053d6d018656d6cd7fd6a5d78
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://baarspo.ru/aws?utm_term=cook+once+eat+all+week+barnes+and+noble PDF link annotation
    • https://cdn.sqhk.co/sututidogo/eibibgj/dallas_stars_hockey_score_tonight.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/9534196.pdfIn PDF document text
    • https://folitovuf.weebly.com/uploads/1/3/1/4/131406115/zuxakivixatozalow.pdfIn PDF document text
    • http://meetporte.xyz/the_norton_field_guide_to_writing_with_readings_and_handbook_fifth_edition_fifth_edition8u8xa.pdfIn PDF document text
    • http://bet-info.ru/shrek_forever_after_torrentzyo9j.pdfIn PDF document text
    • https://dobetabuzaduguz.weebly.com/uploads/1/3/5/3/135312815/rasomaxivalosewemot.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/cc8d68c6306.pdfIn PDF document text
    • https://xisuviwilizej.weebly.com/uploads/1/3/4/3/134320176/gaxefufakitazotu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_601eacda05d53.pdfIn PDF document text
    • http://lienforkid.com/30639106044xrd0k.pdfIn PDF document text
    • https://sikafajowed.weebly.com/uploads/1/3/4/7/134757433/7503339.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481069/normal_6029c777438a6.pdfIn PDF document text
    • http://megatorg.ru/muslim_baby_names_with_meaning_in_urduvov8j.pdfIn PDF document text
    • https://runufegoxow.weebly.com/uploads/1/3/5/3/135347372/2539046.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/tokit/tri_fold_brochure_psd_template.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_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 5136 bytes
SHA-256: fd381c9f7c6b04c10029606b6816910f1de39c8701ac6a497e09976eb50a7f95
font_01_sfnt_off0000f934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF934 10572 bytes
SHA-256: 3908e0bc001232636ac734e0abf52c857bdec1c634c63ffa468deece0b1a7337

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