Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb85eb6574e5f8e…

MALICIOUS

PDF

68.3 KB Created: 2020-12-04 01:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4896cc5c80b1c2221aa978d5ea8f4579 SHA-1: 9d33ab78df79c87aac90a4d05e838fa76adb44b8 SHA-256: ddb85eb6574e5f8eb2c8987391b362772acd0b28844c5bba06e079a2763739bc
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 0.9998

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=qb64+reference+manual PDF link annotation
    • https://lopodudox.weebly.com/uploads/1/3/4/3/134339354/e839c6.pdfIn PDF document text
    • https://defelewag.weebly.com/uploads/1/3/2/7/132741475/0b3638396.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/8925184.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_5f9046f504452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462681/normal_5fab7b4ade18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_5fab6fffee747.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/c412d3b4-87e1-4f2a-936c-eacee73a2dd9/tomb_of_horrors_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ac166b0-9dac-4457-96a0-23ff8573c1af/lazalebulufuwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f43077-c5a8-4d86-a01a-bb2ef5104112/zakafebufabal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf2418a3-990a-4cc8-b2a5-01d4a9370d42/rezalimokiwajaxamoluzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f2303a-5c42-4bd7-bb83-9bd938eedc96/vaxakilereb.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_off0000ce34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE34 5292 bytes
SHA-256: be47daef01424a02e819e87f1bf5908c20551e02c353a6e534ea973204deee8c
font_01_sfnt_off0000e024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE024 10720 bytes
SHA-256: fe6323050273c0d4ab2c6eaa394d9001e4cce0eddced33434e89b3a17a780351