Malicious PDF — malware analysis report

Static analysis result for SHA-256 f54a7cf543bc3303…

MALICIOUS

PDF

74.8 KB Created: 2020-11-26 09:21:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a20d96cbe0ee47a164ef4f1536ef9a67 SHA-1: 9035f943feed02edcff8bb18f1a83d6337d442ea SHA-256: f54a7cf543bc3303806f8f63fe84704a5f4fbad3a0130cfdf607848434e86175
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://trafficel.ru/strik?utm_term=cummins+6.7+delete+kit+forum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500440/normal_5fbedec864f3c.pdfIn PDF document text
    • https://rotafejejulivis.weebly.com/uploads/1/3/4/5/134599198/zewejadulemud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379369/normal_5f8eb3579e527.pdfIn PDF document text
    • https://kulilopoxi.weebly.com/uploads/1/3/4/3/134375859/luripo.pdfIn PDF document text
    • https://domamulobam.weebly.com/uploads/1/3/4/5/134527142/nuzazemogu_tepuvupaxa_xoxagubulizen_lixivuxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404313/normal_5f92b30d60a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fba33752f4cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373264/normal_5fa7a25f1b9f2.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/dalava/terraria_mechanical_glove_and_fire_gauntlet_stack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0e7e585-100e-4c85-a920-91a50f871c42/aeropuerto_internacional_luis_munoz_marin_san_juan_puerto_rico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5795b46f-bd0f-4ba4-b071-6cbf17334f9f/3162502829.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_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 5076 bytes
SHA-256: c5389e49ef912a78ae938b4b0f9f598f414b9f20a95205815e4e5b7c262bc731
font_01_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 11220 bytes
SHA-256: 96e4306b9c2be823af05b1169aa847d2780705cfee2ae01e792c7d580d657d4f