Malicious PDF — malware analysis report

Static analysis result for SHA-256 1909581acf587f3e…

MALICIOUS

PDF

75.0 KB Created: 2021-04-01 13:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 050e89b9b286561024c1b9a488004dea SHA-1: 7ec5c70654e11415109a9c59e158778d20d1aa69 SHA-256: 1909581acf587f3e7f2c393fd755b3670df1eaef13b0cc01c1d3fefbc38ff77a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam tactic to direct users to potentially malicious sites. The embedded content, though heavily obfuscated, appears to be part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://ponafet.ru/wix?keyword=microlux+air+purifier+manual
    • https://nelemiken.weebly.com/uploads/1/3/4/7/134704654/nerogobulinufig_fubudos.pdf
    • https://cdn-cms.f-static.net/uploads/4450730/normal_60525bb0e302d.pdf
    • https://negogepif.weebly.com/uploads/1/3/0/7/130775604/luvopunupex.pdf
    • https://static.s123-cdn-static.com/uploads/4416301/normal_5ff3bd22bf2ee.pdf
    • http://mirijesuwakug.sportsontheweb.net/plantronics_bluetooth_headset_m50_verbinden.pdf
    • http://dosaxixapaxa.medianewsonline.com/noraxiteluzazadi.pdf
    • http://femetorisufi.sportsontheweb.net/53333559598.pdf
    • https://cdn-cms.f-static.net/uploads/4470972/normal_604fbc622c0db.pdf
    • https://static.s123-cdn-static.com/uploads/4489593/normal_6007b84b146a8.pdf
    • https://cdn-cms.f-static.net/uploads/4393041/normal_60544f8775ed2.pdf
    • https://xijutenidipes.weebly.com/uploads/1/3/0/7/130775364/wafoxalavo-nijovamuxaworar.pdf
    • https://siselujasukoju.weebly.com/uploads/1/3/0/9/130969984/gitadifuno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4e73f68-9870-4c81-be0c-0a6dd7607cd2.filesusr.com/ugd/6f53d7_4909a76d113549eca74cf25b25d29e3a.pdf?index=true
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_cadd43268ab541059f08f7666b0511b6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/38ba5d28-bc70-44bc-a6f0-198e02d77ae5/87223255829.pdf
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_8aa18129a835410caeacd0efaf61f037.pdf?index=true
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_1a03951cce8d41d297bf17175fb61d78.pdf?index=true
    • https://s3.amazonaws.com/zabejuvijolu/shark_navigator_lift-away_deluxe_nv360_upright_vacuum_manual.pdf
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_f2b60ede0c5d4a1c99c1974a6202d84f.pdf?index=true
    • https://s3.amazonaws.com/xulepiwa/dekepigitavikilaxa.pdf
    • https://uploads.strikinglycdn.com/files/1d0ccd66-4d0b-4641-9101-d8073227000a/65019331752.pdf
    • https://s3.amazonaws.com/lupuvogotog/canterbury_cricket_clothing_size_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2e.bin
6637b4ee487c30bcd2821efe9f94ed74cce18067554d25cc163b2c60a59287d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2E 5056 bytes
font_01_sfnt_off0000fb62.bin
73165dd0d839bc7c9d4a223e2244bd1d3cad27fb742e82771b99daf3ac87eed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 10468 bytes

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