Malicious PDF — malware analysis report

Static analysis result for SHA-256 604d94f27cb9d1c4…

MALICIOUS

PDF

83.6 KB Created: 2021-04-03 04:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bbae2be3ec62d3f558e4f8d8756517ec SHA-1: 1789853ba067b64f134586c860f1c82d815aa4e3 SHA-256: 604d94f27cb9d1c406c87cd0a468d55ee23a678a4c34c1ada36f7b5922464a95
186 Risk Score

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 0.9997

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://vilenefex.ru/wix?keyword=retaining+wall+failure+arnold+missouri PDF link annotation
    • http://idealica-uficiale.website/mamulixojupatodidbs.pdfIn PDF document text
    • https://nesibebinirudeb.weebly.com/uploads/1/3/5/3/135311353/neroju.pdfIn PDF document text
    • http://p-kavkaza.ru/47396916291ssk8k.pdfIn PDF document text
    • https://metoxuxiduwano.weebly.com/uploads/1/3/1/6/131636764/vilosi_dizafurinon_tijemawutajaz.pdfIn PDF document text
    • https://sanevofodi.weebly.com/uploads/1/3/0/9/130969150/vabuputodezevigizid.pdfIn PDF document text
    • http://pshcomonhere.xyz/10072874847fw6lj.pdfIn PDF document text
    • https://napepoxamugif.weebly.com/uploads/1/3/3/9/133997580/jexudiriza.pdfIn PDF document text
    • http://storezone.info/hitchcock_truffaut_book5gq7g.pdfIn PDF document text
    • https://xaxotomelaxip.weebly.com/uploads/1/3/4/5/134511260/3667193.pdfIn PDF document text
    • https://temerineg.weebly.com/uploads/1/3/0/9/130969052/lunawus_nimanon_lukogixe_vomavev.pdfIn PDF document text
    • https://lukuxafibufogi.weebly.com/uploads/1/3/5/4/135400428/1666484.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/e43a00de-f3e9-4555-8f58-90be4b533990/memento_mori_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6034f28a-564a-42f5-8888-cd09f39702a5/how_to_use_jitterbug_smart_2_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00254699-db34-4a02-8b58-942a9a4b6317/wenojugomidomuti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35c04327-f81b-4409-b701-7eb0f7828b5d/sweat_equity_agreement_sec.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e343966-6797-4c1f-a3cb-10e7609cb078/97805748358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6330dbe8-a832-428a-93b0-a9f5e540f7f3/99965707266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/721169dc-b50c-4758-8030-1c20d4837356/dean_koontz_elsewhere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a21ea46-b070-43e3-b464-aded023bba76/gesepazudatevobev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb8bcb00-2e7b-4602-a195-e5d32fe11b2f/vapatuzumadewopitakoro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb46085c-b0f6-4ed7-a9d8-1fd836433a2c/what_is_the_composition_of_oceanic_crust_and_continental_crust.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_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 5324 bytes
SHA-256: 57dee3a642653c2735c17afd5848dc3c0680ec155a3c4bfa0de9cb352487a989
font_01_sfnt_off00011663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11663 12032 bytes
SHA-256: 028bbc44cf1fa9f555649e53573a877ad0f7b5d0da630ff5580c664e22b96f4a