Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5d097353a334cc1…

MALICIOUS

PDF

83.0 KB Created: 2021-04-01 18:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 55ba9765a7d81598b869a0cb2d8c163a SHA-1: bf22c05a1cd6f021077403e4087e0548da1a3919 SHA-256: d5d097353a334cc11cafaa0ae10bbc57e3abfb5a697d0282932e4a1e8355b66d
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 hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=practicing+the+presence+of+god+audiobook PDF link annotation
    • https://cdn.sqhk.co/bugolajoxodu/hwie6hc/vubosilojebolofelirifu.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/jf93e8I/associative_property_of_multiplication_worksheets_grade_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417817/normal_6014d656d86ba.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/GAaibig/21096412382.pdfIn PDF document text
    • http://reduslimitalia-oficial.site/where_is_navy_seal_training_done1gsgy.pdfIn PDF document text
    • http://muparizuxufuxud.22web.org/kerakoll_fugabella_grout_data_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/zanudiwageg/FFMqghy/best_android_phones_below_6000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_60057a99b4914.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_604b8e2f13c47.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/d4p03qn/zatebawusinezimumejob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_5fd8dd136c197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_179c48611ce2412b8f30b75653257694.pdf?index=trueIn PDF document text
    • http://zogujiduguku.epizy.com/wheel_of_the_year_living_the_magical_life.pdfIn PDF document text
    • https://b42dfab6-8227-42c4-8fe5-fc04d9433513.filesusr.com/ugd/a9a8df_be92c12a358c42d1b13aa9892875afb2.pdf?index=trueIn PDF document text
    • http://fexusat.epizy.com/basic_suse_linux_commands.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_11604eacd96741d0a2665da0669b78f7.pdf?index=trueIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_eef44121bdd144eaad173d95562c3032.pdf?index=trueIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_1c68ed44aff9459a80b5424b3f1eac16.pdf?index=trueIn PDF document text
    • http://voputujewijozej.rf.gd/beautiful_creatures_book_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 5472 bytes
SHA-256: 22d5c3ff331e5632f0127814fe839ab437f3b511684ab03bd174536663d972f0
font_01_sfnt_off0001090f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090F 11068 bytes
SHA-256: b6dde88da07404454cc5dd5d02faf0c286ac8f964dc9a6adc327dcab12baf0e9
font_02_sfnt_off00012ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBC 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2