Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c31f09c5d4b4ba…

MALICIOUS

PDF

71.3 KB Created: 2021-03-23 15:17:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 92765a07f6f783505f854d0657842216 SHA-1: 03a6eba7d3eb4e3ad9fff10e5712ef41ad8a5eef SHA-256: d9c31f09c5d4b4baf47846a2729c41b860b9ff6299ab475978e51bcdb17bee25
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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://mezovuduw.ru/123?utm_term=2007+toyota+avalon+limited+owners+manual PDF link annotation
    • http://prizinsta365.online/rovaxubawiwicubwx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fd0ed0556086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414172/normal_60266f2d60b3c.pdfIn PDF document text
    • http://megatorg.ru/free_cleaning_service_bid_proposal_templateskrm3k.pdfIn PDF document text
    • http://tcerkovniekupola.space/rama_judicial_consulta_de_procesos_por_apellidoseysxe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5ffcfec286a24.pdfIn PDF document text
    • http://podekupe.22web.org/lipijepivuxojinuzifi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427076/normal_5fcd6d90bd6cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kudogato.rf.gd/41121680969.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_4c02b1d2ba7e43c086c3d6c37689bcf6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2779b054-08e0-4d59-b3e6-9b060f1eb7c4/the_police_ghost_in_the_machine_half-speed_mastered_vinyl.pdfIn PDF document text
    • http://tadukaxuzevida.epizy.com/81782526775.pdfIn PDF document text
    • http://rewoponoxeki.rf.gd/45092942401.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_d6924f2470dc42988043a10ce1e336e7.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_e8351fb329d84ffebadf0df9a9737a5e.pdf?index=trueIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_12ac061a38014a3d9f4baf4240362e3d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d6d31c1-4dbc-45c4-a279-fb3673ae1884/xuruguzebamuzujusimamizaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a36ddbe-8465-40d6-9ca9-1f663fd46f6c/92834987970.pdfIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_7f727a5eefd749beb88d681b2fbab9b3.pdf?index=trueIn PDF document text
    • https://21036261-01f9-4725-a342-2b8b08d10099.filesusr.com/ugd/d0cbc4_a70f9255dedb4203b1f731b99e58c0c3.pdf?index=trueIn PDF document text
    • https://05790d5e-93e9-4545-bcc4-99c37f081c18.filesusr.com/ugd/bff4d5_64cef7b2cc514a25be044ca56b4804b7.pdf?index=trueIn PDF document text
    • https://eac5c218-d238-408c-98a6-8ff0ecbb25fc.filesusr.com/ugd/b1277d_65f8c6b6cae345a9a0905d348bfb6f80.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c19fd5ff-3a5e-46e7-8098-8814fadbf173/ga_violation_code_40-6-16.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95ab630-701a-4f3e-ac38-dc02d3139f70/how_to_become_a_drivers_ed_teacher_in_nc.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_off0000d96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96B 5484 bytes
SHA-256: 1442a356c40e493db760c3fe76389ab3f50243923f458c00143e7cac5bcfefd1
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 10388 bytes
SHA-256: 3c291a9f3016538d5bb8630590da9659d3e739f0497056b7f94c5f3e14db17a2