Malicious PDF — malware analysis report

Static analysis result for SHA-256 401452da5f335f62…

MALICIOUS

PDF

75.1 KB Created: 2021-03-13 18:22:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 452bef6c05d52f8d7c46811be553a545 SHA-1: b743cf8b9f1ffe731c51caa6598c3ecc1baa259a SHA-256: 401452da5f335f62af00fd6027a93478cf0a52a30fdf2eacc36edb1f8b3ee8f6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 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.
  • 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://vilenefex.ru/123?utm_term=coulomb%2527+s+law+worksheet+answers+pdf PDF link annotation
    • http://it50disconto.info/85093157388gkmbl.pdfIn PDF document text
    • http://shopee24.site/radar_mobile_speed_gun_for_sale5pc9q.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/juverarabizifasakawofesa3j96d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383792/normal_600046b20ef30.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/egijjIM/53618474017.pdfIn PDF document text
    • http://leadtop.co/cloudy_urine_pregnancyuw6q9.pdfIn PDF document text
    • http://verification-help.business/block_all_outgoing_calls_android4wy8c.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/ejNr6i3/tutobimisawabepovelob.pdfIn PDF document text
    • https://cdn.sqhk.co/sowojusawepu/0ggjBYz/xagapuxoluwowufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424013/normal_6012334836140.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378175/normal_5fccfef4871e3.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/lxgevig/pagonisopokulijimonomoses.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogusobade/cihte4P/80281190871.pdfIn PDF document text
    • http://naykaryadom.fun/zisifosijowepovusaruvigbs4dz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8674ab6e-6ff6-4114-ad62-a24638bc5783/evenflo_car_seat_with_base.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318cac51-83b1-4d42-83d6-0505824b7269/eventide_h9_harmonizer_vs_max.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2474640-bdec-47b4-91f5-e9b004318fa5/xagiravopitutokenupaset.pdfIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_b92a71b857184477b354d11bab1852dc.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_cdc992e8d4764948a100b9337d457cd6.pdf?index=trueIn 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_off0000e96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 5516 bytes
SHA-256: b379fa3adac432ffd5de3a1e4520cd0b4d9e3bab86bec6ad67bb6c6c22f6f46e
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 10280 bytes
SHA-256: 4bfd3a35c5849d8f5e0cc404a9373a2278ea60b68fa5af67a5c46032f89f3968

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