Malicious PDF — malware analysis report

Static analysis result for SHA-256 73287559e6cc1ff0…

MALICIOUS

PDF

79.7 KB Created: 2021-03-17 00:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 32f1472757aaf0a8e6b6a836e45d49ee SHA-1: dda7e78b9ca8571c7dd1c74a022e9f47b58fc0de SHA-256: 73287559e6cc1ff03ae0ea83bac1a6d8411e8ab4a80accf77349934512b83be9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the document's structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/strik?utm_term=dell+latitude+e6540+date+de+sortie PDF link annotation
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/senirikepek.pdfIn PDF document text
    • http://geleostone.online/cvc_words_puzzleslio87.pdfIn PDF document text
    • http://tells.fun/meepo_city_rider_2_for_sale7nw7a.pdfIn PDF document text
    • http://picsonair.com/rulokezorugodoniwesipn5eux.pdfIn PDF document text
    • https://lewezuwarekizes.weebly.com/uploads/1/3/4/0/134040914/duwuvegalo_wefuka_rudeba.pdfIn PDF document text
    • http://shoop-fk.ru/rupinder_gandhi_2_sad_songs5nc5.pdfIn PDF document text
    • https://wilubiluzitewi.weebly.com/uploads/1/3/1/4/131413550/c3db6a1.pdfIn PDF document text
    • https://dawunatebebi.weebly.com/uploads/1/3/1/4/131408224/poduxobonota.pdfIn PDF document text
    • http://badge-verification-center.com/wanda_sykes_monster_in_law_quotesjtnsy.pdfIn PDF document text
    • http://erse.xyz/hoover_steamvac_dual_v9tt3e.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/1eb93fc4-f883-4361-9654-efe33fd6c025/how_to_improve_your_social_skills.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5364e8fe-b099-4c7b-ba7a-86d4215921fa/29511230425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15667829-53c3-4ea1-ba2d-f53dab964400/xusevixodoluzixebodep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0576d3-3e5b-405f-b8cd-a7cd78ad84a3/mathematics_textbook_for_class_7_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97405cf1-46f4-4d26-8605-78e2ed10430c/name_three_branches_of_government_and_their_duties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6880d7ca-4588-460e-b744-f54b62702269/how_to_adjust_belt_tension_on_ariens_snowblower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea64ffa4-261c-4b9e-9307-623d9b8b8991/figawonurolixajozije.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_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 5324 bytes
SHA-256: 7987901e43a11c66626386e4876f2072dd70b8c2bae1ae30dc31f04ae2b8c481
font_01_sfnt_off0000fc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC27 23068 bytes
SHA-256: 2f7f6e784ab17e1b829e9b029bae49f8233fc46337c8db58d4e53396f1d942ed

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