Malicious PDF — malware analysis report

Static analysis result for SHA-256 253193153856b095…

MALICIOUS

PDF

71.6 KB Created: 2020-12-25 12:23:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7563ad0161a2051362f9729803ee0f84 SHA-1: 163592c5b88ea92ddfbdbeee9fffb8380c160f07 SHA-256: 253193153856b0951731a5284616615c407648a370474f8c8fcb03bd44fdd594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was identified as malicious by an ML classifier and contains a large number of external links, many pointing to disposable hosting. The primary malicious URL is trafffe.ru, which appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used for SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://trafffe.ru/strik?utm_term=caponata+siciliana+ricetta+originale+catanese PDF link annotation
    • https://tamilazubi.weebly.com/uploads/1/3/4/6/134604156/xaniba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476272/normal_5fe4e2e487ab7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_5f995e09902a4.pdfIn PDF document text
    • https://tudekazesabi.weebly.com/uploads/1/3/4/3/134367585/226830.pdfIn PDF document text
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/logubogepegugonu.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/komotasarab.pdfIn PDF document text
    • https://vepezifu.weebly.com/uploads/1/3/4/2/134265798/c81370da95bca.pdfIn PDF document text
    • https://gipavibipo.weebly.com/uploads/1/3/4/6/134654588/1020437.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b25d85db-7ffa-4cd3-9e03-e5d3948a6563/79827211338.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/jasupugaginivojotuvut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b37529-7d10-4a0f-bf13-a1215678ff06/bopafuwekojimufuzeji.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/land_area_calculator_app.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 4912 bytes
SHA-256: bfb4cb20342a363400cf30c15743a62c5c9ea09b37a4d63f683e38a4ea9d2e04
font_01_sfnt_off0000de3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3E 10996 bytes
SHA-256: b7365959d77ee06b9aa44de08b4be80493e84cf71942d46d6d9ae6e17c03b4ec
font_02_sfnt_off000101ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EC 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e