Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e28f3dde8c04ca6…

MALICIOUS

PDF

74.9 KB Created: 2021-03-16 11:15:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7feb6bb97761cd92bbacf4f80e652623 SHA-1: 5428feeb0202c316672697ec08e3fa1b3835692c SHA-256: 6e28f3dde8c04ca66e7dd31ad4fc12ee602361f65ad9ef986639e023985a0f73
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting and are likely part of a link farm designed to distribute malicious content or engage in phishing. The presence of a malicious URL and the ClamAV detection strongly indicate a malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nipisod.ru/123?utm_term=logo+dan+maskot+asian+games+2018 PDF link annotation
    • https://vovaderinikuxu.weebly.com/uploads/1/3/4/5/134528816/kewivafunumedit.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/hfhiMSy/56482313320.pdfIn PDF document text
    • https://nuxirudeduw.weebly.com/uploads/1/3/4/4/134442083/9976395.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406771/normal_6000f3e5c883b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375356/normal_5ff8d3b873670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445326/normal_6047c68321e16.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/iftLnyP/34685581690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370269/normal_5fe8b27f1ce32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378170/normal_5fe386633a26a.pdfIn PDF document text
    • https://vorufiduwesonuf.weebly.com/uploads/1/3/5/3/135314955/deserelonobufik_tubufijimolip_gezenoxobidata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459464/normal_5fcb757d888ba.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/0b08227f-69f0-4f43-8f4c-aae5fdf8da6e/minecraft_guide_books_8-book_collection.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243bf9ce-b9f1-4061-99f7-26d0806c1d07/cuisinart_-_burr_grind__brew_12-cup_coffee_maker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37963e66-ef72-4d50-9bef-aded480b8f63/yt3000_craftsman_parts.pdfIn PDF document text
    • https://83d12552-0bc1-4415-b221-1da25caacb9b.filesusr.com/ugd/1e11d0_d72848c363ff4360bffd2fa2fd9788b3.pdf?index=trueIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_4bdc870599e6420595ff11afd17d3a9e.pdf?index=trueIn PDF document text
    • https://44f39d5c-a655-4437-91b6-62b11e148e71.filesusr.com/ugd/eb4c03_62540ed13f07432ca04c089adf2446cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ad4ac5-b59a-4037-8a9b-d9eb117f23c9/33797939689.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_db509019925a4d10a4a4f4bb260182eb.pdf?index=trueIn PDF document text
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_e0f5bb690aac48e3a4a6fb8b2b520942.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc3946d-c86b-42d9-a5ad-67fb0803932b/derubixiremuluserizetiwal.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_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 5544 bytes
SHA-256: dc3b64d02a5a9f69c22342580b5ea912a69d833d46b5f19befc68330f7932db6
font_01_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 10324 bytes
SHA-256: fbd796b5cd3434cd4158f4934a9674d994edcf1c3a17aae054819ef8f30f129e