Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fd9005c3c83075f…

MALICIOUS

PDF

81.6 KB Created: 2021-03-31 03:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b57deaa9fef678128ecb983484f9efac SHA-1: 2aa8cab16444389bdcdee0d615134eb78e54e1f0 SHA-256: 8fd9005c3c83075f8d0a2666360bbe2bd1ea8c6639a54777a3456fe95ac7aac4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism designed to lead users to potentially harmful websites. The document body, though partially corrupted, suggests a lure related to purchasing a used caravan, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=what+to+look+for+when+buying+a+used+caravan
    • https://cdn.sqhk.co/zaborofisi/gc7iihd/12327759702.pdf
    • https://cdn.sqhk.co/resilano/5ijWhi6/88014561255.pdf
    • https://cdn-cms.f-static.net/uploads/4415740/normal_5fd9e22cc05e7.pdf
    • https://static.s123-cdn-static.com/uploads/4420030/normal_6000e466715a0.pdf
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/vuzeziboxaz-xotabuzaletirof.pdf
    • https://ludiwutigavas.weebly.com/uploads/1/3/4/6/134697468/3441148.pdf
    • https://cdn-cms.f-static.net/uploads/4390366/normal_6059763529cab.pdf
    • https://cdn.sqhk.co/tubadaluzafu/jdI9uhe/vegan_banana_pancake_recipe_gluten_free.pdf
    • https://cdn-cms.f-static.net/uploads/4444852/normal_603ea02beb88a.pdf
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/keborabopoxupof_larasuvepip.pdf
    • https://cdn.sqhk.co/vafodagusun/hl4ig4Z/one_good_deed_children_s_book.pdf
    • https://kojelokawuzu.weebly.com/uploads/1/3/4/3/134341929/cebc8c5a9.pdf
    • https://cdn-cms.f-static.net/uploads/4483337/normal_5fea0bf5b26eb.pdf
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/7032411.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mavixu/kajevog.pdf
    • https://s3.amazonaws.com/roware/balance_sheet_structure_example.pdf
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_36213e6612d34d12914a288c1f71cb51.pdf?index=true
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_444b7c787e9641229c9097524e9f9cad.pdf?index=true
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_a2dcb7d943464c67a4c1bbafd0a25472.pdf?index=true
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_2e7dc268313649cab67079349c5b4f11.pdf?index=true
    • https://3350d16e-2476-487b-844f-3942c02081ad.filesusr.com/ugd/25270e_f35f3c867563497ea95a0a3472fdc2a2.pdf?index=true
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_a9b8f7fe1e6a401797d951d1ec1a679a.pdf?index=true
    • https://s3.amazonaws.com/potofaw/router_configuration_commands_cheat_sheet.pdf
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_6adb8ccefece4402bd598be35b63a9ad.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd6.bin
af1d6779e4deb1204118b3bc39efeb27a560bac14c476c6956bcdbd743f56653		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 5756 bytes
font_01_sfnt_off0001138d.bin
80b2bb6abb15187b37211cd706d90769fdf3f4cc93fd1f2ffd0cbc100451ec8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1138D 10884 bytes

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