Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b4f4d8076beb56…

MALICIOUS

PDF

72.3 KB Created: 2020-11-20 18:19:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 52f8bc3250479ed0d4eeffbe54db9c59 SHA-1: 2fa1a1394c9e9774e8ee658e586de0f9c41ab373 SHA-256: 36b4f4d8076beb5694f4b47535e03a375ca9561a39eaa793f40347020c65640c
156 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 0.9995

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 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.
  • 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://trafffi.ru/123?utm_term=soap+box+derby+car+rules PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484835/normal_5fad27bd2f136.pdfIn PDF document text
    • https://wilujogid.weebly.com/uploads/1/3/4/3/134347442/c98d7a41596744.pdfIn PDF document text
    • https://wokozizexufam.weebly.com/uploads/1/3/4/2/134234926/xakip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/60218819633.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/problem_and_solution_definition_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/runat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec4d55ff-489d-429c-b096-63149a794be0/girenevomifidopa.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/losew.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/riderufalavifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8aa8ab2-2e8c-4a04-8a50-5f9ddf92880e/krt_sorununda_demokratik_zm_bild.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_off0000dddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDF 5480 bytes
SHA-256: a4b1985ba7ea9272c5eac00bf4b6911a08c29f893556b962511e2c6f94420cf1
font_01_sfnt_off0000f095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10796 bytes
SHA-256: f29d330baa54e1989b1493b55221a676575370583b129ac119c38202fa890c73