Malicious PDF — malware analysis report

Static analysis result for SHA-256 485cc8ea2b26b42f…

MALICIOUS

PDF

66.5 KB Created: 2020-12-01 23:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87f8c376345bcd60e0201db13e24cfdf SHA-1: 79945eddd85d12dffe2f7c70994be783ad34bfff SHA-256: 485cc8ea2b26b42f91e80ef219998766a8f490a9d23b191ca17ba2c9b31017c4
196 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of a 'Password-protected archive handoff' heuristic suggests the document's intent is to trick the user into providing a password for a malicious archive. While no scripts were extracted, the PDF contains embedded URLs, one of which is a link farm, and another points to a potentially malicious domain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffine.ru/aws?utm_term=avengers+endgame+theme+song++ringtone
    • https://sojejizewo.weebly.com/uploads/1/3/4/4/134460985/d0beeae.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3ddb02f-9db4-4bd8-ba15-5baf9f74e839/el_conde_de_montecristo_resumen.pdf
    • https://uploads.strikinglycdn.com/files/5bac5914-6d12-4b7c-84bd-ebde015fbbb8/days_to_august_15_2020.pdf
    • https://s3.amazonaws.com/vinejivunitego/google_chrome_for_windows_10_2019.pdf
    • https://s3.amazonaws.com/pujinit/javobejen.pdf
    • https://s3.amazonaws.com/vuxalirudidel/21484500698.pdf
    • https://uploads.strikinglycdn.com/files/19eb3f76-c9ed-48b3-b576-b0948f93eaf0/vawidagobigigo.pdf
    • https://s3.amazonaws.com/tugumeb/materiales_metalicos_ceramicos_polimeros_y_compuestos.pdf
    • https://s3.amazonaws.com/gixawetopoli/peltor_comtac_iii_user_manual.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_off0000c5f9.bin
25b9ef3df68dee38f45b17965f906b09d4eb413c356769644dd345dacdfb24af
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F9 5256 bytes
font_01_sfnt_off0000d7ba.bin
601c44131c002f054c38a6a126e8ccced84cc39c8b8ce8a883e9bbe130c4d615
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 11232 bytes