Malicious PDF — malware analysis report

Static analysis result for SHA-256 f34fc11aed284659…

MALICIOUS

PDF

75.9 KB Created: 2021-03-06 19:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 341203abdec124fabce80d6f4ebfa6b4 SHA-1: b44b0dfece32ba81939c637e971156574e0533c3 SHA-256: f34fc11aed284659c2202094ed134afa6ed9c8e889ddf2cc50d7f510589961b5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting, and is detected as a phishing trojan by ClamAV. The document body, though heavily obfuscated, suggests a lure related to game walkthroughs, likely to trick users into downloading further malicious content. The ML classifier also strongly indicated maliciousness.

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://mezovuduw.ru/wix?keyword=pokemon+sun+and+moon+walkthrough+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4374368/normal_5fe4336fe91c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373297/normal_60380085eda2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401994/normal_6036119d4f308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482849/normal_60254bbbcf03f.pdfIn PDF document text
    • https://taxebalipawixu.weebly.com/uploads/1/3/4/5/134598188/8e4ae3b1.pdfIn PDF document text
    • http://tesar-krd.ru/2019_ford_mustang_ecoboost_convertible_for_salen0z8i.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/dofipi.pdfIn PDF document text
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/6e4038001ba536.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/1295525194010se2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fc5f65267520.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461773/normal_5fe23c9d095ef.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/bea59566-4b26-4f9c-99a1-74cb9dc5eaff/kujofizubudegobifatefe.pdfIn PDF document text
    • http://diwavubodinaroj.myartsonline.com/how_to_calculate_man_hours_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d240c80-e2f3-470a-b4d7-9463f45be962/edo_girl_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/153cf1ca-71cf-4a90-b01b-81fb89f89e76/nora_roberts_book_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88a912c-1379-4220-a6c0-fe69f6e269d4/understand_theories_of_management_and_leadership_and_their_application_to_health_and_social_care.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/zapagefipekubozorawidiru.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_off0000eab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB6 5612 bytes
SHA-256: 16fde019382c66a11aaada5fa57ab27d289543562b7b0c83ce9836b6b42cef01
font_01_sfnt_off0000fdbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 11644 bytes
SHA-256: 12e91e705c18694ee4c476cc6c4b9a96444359b990ae8ed720cf16ff757a0745

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