Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3a4ee4a96978df…

MALICIOUS

PDF

71.6 KB Created: 2021-03-28 17:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c9ef7e472503694624f4b08139520cb1 SHA-1: 83c386182337f502185aee84746cbfd9e99460c7 SHA-256: fa3a4ee4a96978dfaf1b5abd7563493130f4dfb6cbd3a00ddc13029be6d80e46
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL is associated with a link farm heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://golowaki.ru/strik?utm_term=drinkwell+water+fountain+replacement+pump PDF link annotation
    • http://fuvisetitisenon.mypressonline.com/17540506822.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/on_the_origin_of_species_by_means_of_natural_selection.pdfIn PDF document text
    • http://katipef.medianewsonline.com/latimejotasiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458854/normal_601b4325a4479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393901/normal_60089c15050bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_5ffccf0325235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453734/normal_605868279ad95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457011/normal_604022f027c7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377905/normal_5ff7a1fa683af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377908/normal_603bc36a43765.pdfIn PDF document text
    • http://ig-mediateam.net/what_is_the_best_air_fryer_recipemlmfy.pdfIn PDF document text
    • http://drilltech.info/24846561389rhd60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_601bafe017d95.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/11355315-cfa4-4afe-8fdc-76c38ddb15a0/61694529932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ccdb22f-e00f-4f5b-b382-3e5d69d4049b/27480712070.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/652a703f-11c4-46b2-8b16-54e7d7d43dfa/19220019931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02778012-038d-4d53-9a58-92b919a478c6/82284648818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43933fc3-aa96-4c97-bf9e-b40b8bad5d6c/how_did_road_warrior_animal_die.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35cc3e9-6013-4750-a717-4079fbc49159/sura_yasin_bangla_translation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaa0047b-0b1d-46ec-b295-a5c92b56d785/xirexi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f9225d-8b17-4c2c-aa7f-183da6fa2ab2/fegigodifoguvoforaliruvi.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_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 5136 bytes
SHA-256: b5bd6370599f3dcb02b330f6e6edd6f12138d0859ebe980e4c0b53d9e4893069
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 10508 bytes
SHA-256: 576ce64abe54e08386d171423ad17785f9d41e20bb6d9e062ec76f6b8fe8cc8c

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