Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0b369c60cc64da…

MALICIOUS

PDF

68.9 KB Created: 2021-04-23 19:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 058aca5daf6a6e69b7e87ecc96d5407e SHA-1: 794ae30510505364b2e86e1b915b9a1b2653031a SHA-256: 6f0b369c60cc64da6a75a6cb6a63a992422b9f4c99fca29232077e67d21f255e
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/strik?utm_term=honda+wave+110+alpha+engine+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365542/normal_6054e4548f92c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_6019a7a427102.pdfIn PDF document text
    • https://veguxalefimas.weebly.com/uploads/1/3/1/3/131382166/luxidoveb_nazavabalejubi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388424/normal_5fca7fd38aa81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451971/normal_60258eb7e98e8.pdfIn PDF document text
    • https://fivujage.weebly.com/uploads/1/3/4/3/134316273/2444af8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486965/normal_602deeb0291f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420230/normal_6004a50bdb65a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453105/normal_5ffa1e8b5e9c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_605615c389914.pdfIn PDF document text
    • https://zomudefe.weebly.com/uploads/1/3/0/7/130740133/wubafesenaviwilanawu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5fdeaaa487c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474734/normal_602ae0dbf06f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_603e6e856022e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445742/normal_5fea2011acdba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445343/normal_605357fe416cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417670/normal_5fedc9db38332.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/866c1fdf-0a6f-421a-bfd2-8b5fb2de82e5/the_great_depression_causes_and_solutions_worksheet_answers.pdfIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_8c6c70bd636f4d1887ca2134fffcec97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9a00fe5-4067-47f8-93a6-7445da303b8f/what_is_the_history_of_modern_art.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_7e4a8cb1f2354ca986d063796ab67499.pdf?index=trueIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_b414e3cff2c74d27840ee93c578c0697.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_a6d6bc1a57994e8288ddd392753a95f8.pdf?index=trueIn PDF document text
    • https://0c7b1e5d-10e9-4c66-9a64-57e6babc74f3.filesusr.com/ugd/6b59ba_83a4792f58244e37b620d4075e26d217.pdf?index=trueIn 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_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 5504 bytes
SHA-256: 10721c3d3eb2b5952118c9e8d62953578cf5b04183259878c8c48656de2be9e4
font_01_sfnt_off0000e411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE411 9992 bytes
SHA-256: 63edb9d22cfe683cc16c9372ef36f0375868c131895beae4363e2b1259687641