Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c431f7baca68a3…

MALICIOUS

PDF

83.7 KB Created: 2021-05-17 05:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c3446eb6d5b6f109b88cf2844e9ae7b8 SHA-1: 02c259b7a1f7dfccb8848ea07b3ba7280bbd211c SHA-256: 73c431f7baca68a301439ba5a746da368d5d9dd1acccdc509575d5827894e906
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document, possibly leveraging embedded JavaScript for redirection.

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://dugedepap.ru/strik?utm_term=diccionario+hispanico+de+dudas+rae PDF link annotation
    • http://visunuduxat.mypressonline.com/a_monster_calls_book.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/iIFxm7q/land_rover_defender_130_pickup_2010.pdfIn PDF document text
    • http://derilezin.sportsontheweb.net/diferencia_entre_sociopata_y_psicopata.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/wYhi5zN/joker_mask_photo_editor_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bolomadu/ehfijje/idle_robbery_mod_apk_download.pdfIn PDF document text
    • http://ottics.ru/48074354828qunb6.pdfIn PDF document text
    • http://fullstacket.online/phonics_workbook_grade_2nwdj6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipagolawalixa.onlinewebshop.net/zupovegafuror.pdfIn PDF document text
    • https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_06c4c1af940d4e8ab6d6d84b02ec43fd.pdf?index=trueIn PDF document text
    • http://kakavogulogij.onlinewebshop.net/bilinguality_and_bilingualism.pdfIn PDF document text
    • https://e39bfc17-a898-4016-ac91-fc9303c112df.filesusr.com/ugd/b5068a_86acc61a364643e6a5cbb8fdca64aecc.pdf?index=trueIn PDF document text
    • https://57eba762-b826-4879-8d7a-7f480aba2934.filesusr.com/ugd/e89c2b_2c89da801a3540359fd43631877cc9c9.pdf?index=trueIn PDF document text
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_838beca1b5734a2aa343fa4edc8bc313.pdf?index=trueIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_79fda323403748568c5393f417c56853.pdf?index=trueIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_890c327aab2141969b5d39eff0c8dd33.pdf?index=trueIn PDF document text
    • https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_bcd4bd7e14ea40af88ac0ebc9f2fd6d2.pdf?index=trueIn PDF document text
    • https://18bc7be3-897e-46c1-a475-efc190d089bd.filesusr.com/ugd/62845f_ba775cb7d8dc4e36bf575e37ee3af1ad.pdf?index=trueIn PDF document text
    • https://6b2d4799-12fc-456d-8881-596234ac9a0a.filesusr.com/ugd/ae8ff6_c22401fc86814f96906c8b8ec02259b4.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_eda662c20add49b7aaa4fb93ac80dc5d.pdf?index=trueIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_01df2e75b7a34aea8c7d00e0bd9299e4.pdf?index=trueIn PDF document text
    • https://fac30f9c-1bc3-4ff6-ac40-7ced1d2a170b.filesusr.com/ugd/3b7182_23f2b3d9f8a84a8b9d65a89bee84c4fe.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_22f3fe9707264f4b961966bb1f73dc54.pdf?index=trueIn 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_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 5128 bytes
SHA-256: c4ef94c97b3de268f178e4447e5042c6d27c45939265ab8ae560945cceb9e030
font_01_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 12796 bytes
SHA-256: e25d3dfc5b3e80804579e5370b4bb147d6e2425468aa830cb095eda92bca191f

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