Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf91c11900dccaa…

MALICIOUS

PDF

74.6 KB Created: 2021-03-05 15:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a8e1195b86c1c96672be8f72b4fad5a7 SHA-1: f431ca36ebcd32aa3c86b09f21c072e4adb59ac0 SHA-256: 6bf91c11900dccaa9763b74ca450223d63f0f43d2f2dfce795231d5fa9eeec60
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=teaching+by+principles+second+edition PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481847/normal_5fe7b234b0283.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485318/normal_5ff14ca6433b0.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/45102483464.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_5fe8fc535614e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367004/normal_5fed3e851c756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5feb4705a9e10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_600d0e88e8c29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417523/normal_5fe706eec8958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452392/normal_5fd26fc86e848.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_33fa0aefc57842c88800ebf6f73a0378.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/lobemo.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_244bb42590ff442d8a8893c1f1f634b3.pdf?index=trueIn PDF document text
    • https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_5f625e87aac245c4a6032fffb5fcf95c.pdf?index=trueIn PDF document text
    • https://78e27e65-9996-4239-a63d-7a21722db537.filesusr.com/ugd/03f576_88e2121035d8414ca7e9f862e6cf0d61.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_1d6fb5bf6848459a8cb3abbe837d7629.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/80765555276.pdfIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_1854ebc087014813811a226a3402dbc0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/vuzikikakomikeredekamisi.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/kenai_river_trout_fishing_report.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_069f96937408459f8b9bb3e36e84bc5f.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_32942aefc9b542919be2818cde9dd8cc.pdf?index=trueIn PDF document text
    • http://namepafubi.atwebpages.com/fedotebotenavob.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/collocation_activity.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_off0000e649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE649 5524 bytes
SHA-256: e0f1737fdd00aab562e333da64470cf1e24eaa5a5c3eb87c5e30126fe1cfbcf9
font_01_sfnt_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 10640 bytes
SHA-256: cab5b73d981dad5438c2ca1a2e33a5698ddc39fa749190babf5e02b1fcb451bd