Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c69116e664e676…

MALICIOUS

PDF

71.7 KB Created: 2021-03-20 11:35:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3640a7d0ba471c26c18efe3d6aa524dd SHA-1: d184e17d68d64ca4c1b3d29d5b8dad8327ae8967 SHA-256: 38c69116e664e676626079f3bd9eeb97bb40dac68c71ad9061fc9a1669bad7eb
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 hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the presence of numerous external URLs, including one with a 'strik' path, points towards a malicious intent to redirect users to potentially harmful content.

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://golowaki.ru/strik?utm_term=raspberry+pi+4+32+oder+64+bit PDF link annotation
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/bonadiw_bajiratedev_koxasawodibufep.pdfIn PDF document text
    • https://xurobogi.weebly.com/uploads/1/3/1/1/131163732/94f27212b8cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504839/normal_60302ef221962.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/fthf4he/pewufok.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/hv5Yjf4/harvard_business_review_magazine_cost.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_6028b8b402ba1.pdfIn PDF document text
    • https://cdn.sqhk.co/sedefoken/bdjhje1/laparutafujuditekokuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501385/normal_601b87c848f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445128/normal_60311f115e14c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481527/normal_600ec19ae8927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478928/normal_6022dc877dabc.pdfIn PDF document text
    • https://bodizolisasutez.weebly.com/uploads/1/3/1/8/131871954/wudezazaxugin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_601d8cb77cb75.pdfIn PDF document text
    • https://gozizakodo.weebly.com/uploads/1/3/2/3/132303179/wiwozu.pdfIn PDF document text
    • https://cdn.sqhk.co/rarirawibowo/coGggic/matchington_mansion_hack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365998/normal_604d9a772b82a.pdfIn PDF document text
    • https://lojopozubog.weebly.com/uploads/1/3/1/6/131606756/lojuxij-keziw-gimumo-gaferimaketune.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464730/normal_5ff4d4847e9f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widusop.atwebpages.com/agatha_christie_hercule_poirot_s_christmas.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/jungian_archetypes_book.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/20301421694.pdfIn PDF document text
    • http://tudixuzaw.onlinewebshop.net/convert_to_word_online_with_ocr.pdfIn PDF document text
    • http://gukutimaguvuzum.onlinewebshop.net/tumibekinare.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_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 5708 bytes
SHA-256: 87cbfa7b135c1508474b7e5db955cf4edee307a916eadbb26b5cea679b409eda
font_01_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 10884 bytes
SHA-256: 4dcb9011ba26108edb9e3e5f43953783bfb650708310871339081275f735412a

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