Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc97f3ec8de65ce5…

MALICIOUS

PDF

95.5 KB Created: 2021-03-09 09:19:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 028b5ad1f2d50e5b78299c3f748fe901 SHA-1: ee857ea928bb5d5dc6019a041cdc225fb5534930 SHA-256: cc97f3ec8de65ce5426449bb8fe946a8191f8866687181df0217802967401bfb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=how+to+clean+ninja+foodi+grill PDF link annotation
    • http://momentshop.space/gikojutuii4l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fd393d31330a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453914/normal_60297ba612e45.pdfIn PDF document text
    • https://vidafipi.weebly.com/uploads/1/3/1/6/131636743/08ba56da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411926/normal_5fcdaadf5b8d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465538/normal_5ffa38a8cebf3.pdfIn PDF document text
    • https://bunutawopuzo.weebly.com/uploads/1/3/4/8/134868528/5905a.pdfIn PDF document text
    • http://familyit.info/anaerobic_endospore_forming_bacteriaaiot1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_603360b6d12e6.pdfIn PDF document text
    • http://padlamadla.site/the_night_before_christmas_film_netflixu05j2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381534/normal_5fca6b82a8e82.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/vivakozorepo.pdfIn PDF document text
    • https://bobixazila.weebly.com/uploads/1/3/4/5/134599816/baadfee9f28e8c.pdfIn PDF document text
    • https://gadujixefanupu.weebly.com/uploads/1/3/1/1/131163635/3013716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447916/normal_602067442fa26.pdfIn PDF document text
    • http://wonnaturila.space/harappa_by_vineet_bajpai_free_downloadsihez.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/49dffdab-43e1-46a5-a754-c7d896fb397c/vegetarian_keto_cookbook_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6aaf99-21e6-4687-9840-baf4b8b90db4/77865663865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ee1ef8-9469-43f1-baf4-9e2dbcd1790a/89869547283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04595ce4-59e8-498f-9475-2fdc3f9f5896/smart_weighing_scales_reviews.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00012780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12780 6744 bytes
SHA-256: ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
font_01_sfnt_off00013868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13868 5140 bytes
SHA-256: 0f69cd8dcbf4fcfa5d190cd0f30be91c54c31eb1338ad3070e21ddfaf4ae5cb7
font_02_sfnt_off00014a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0C 11468 bytes
SHA-256: 2f93893f051b8e52df4c149c78d2efb074f6dbcc0016b6b9419b2d61bfd45698

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