Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8fa1d959415acb…

MALICIOUS

PDF

84.2 KB Created: 2021-04-08 00:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 32c768041438c3708b30c2ab1502d381 SHA-1: 9fb5298fa9e6d8603787f9ae81639081efcc4d9d SHA-256: 8c8fa1d959415acb3621805aa8c6549feea86335f614a979be37e8df99980347
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://jottigo.ru/123?utm_term=lucky+almond+meal+nutritional+information PDF link annotation
    • https://revevapeseguv.weebly.com/uploads/1/3/5/3/135387876/vojibixogenefefutog.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/ihqLKr0/comedy_central_schitt_s_creek.pdfIn PDF document text
    • https://saripubisopa.weebly.com/uploads/1/3/5/3/135322362/lanusurubanowa.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/fjfhhhH/fuganofa.pdfIn PDF document text
    • https://xadifera.weebly.com/uploads/1/3/1/4/131438156/6197908.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446259/normal_5fc655d8597f6.pdfIn PDF document text
    • http://uaregroup.com/the_secret_owl_garden_picton_castles7tbx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452161/normal_6004b121742b3.pdfIn PDF document text
    • http://dommasters.site/free_lagu_cerita_cinta_kahitnafm26h.pdfIn PDF document text
    • https://gijamaxo.weebly.com/uploads/1/3/0/7/130740113/diwefasiv_rinujixigiv.pdfIn PDF document text
    • https://zupedadozox.weebly.com/uploads/1/3/0/7/130738974/rakarupa-soxujikazefan-supomuramev.pdfIn PDF document text
    • http://limecash.xyz/26506362240i2yau.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5fd8ebd0367ca.pdfIn PDF document text
    • http://webmastervlad.ru/vsp_employee_enrollment_formo754u.pdfIn PDF document text
    • http://copyrightsafetyhelps.com/beats_studio_3_wireless_manual5ul82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_60677d0598a3f.pdfIn PDF document text
    • https://pibowalemarume.weebly.com/uploads/1/3/1/1/131164440/dalox.pdfIn PDF document text
    • http://1s.london/68136806980p1ggk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C4 5096 bytes
SHA-256: d6c42ed7df3954891d25ecfbadee5d0d6b3d70c9970080fc9a6d544707d1588b
font_01_sfnt_off00010619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10619 11552 bytes
SHA-256: 28ef66b14c0d27b2baf4c5ced8bcd2f41d324a7614a3501b145736b9a071ffbf
font_02_sfnt_off00012d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D93 16312 bytes
SHA-256: 975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15

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