Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df8a6ba5abcdd0b…

MALICIOUS

PDF

76.8 KB Created: 2021-05-04 12:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 21dba9035b6e9c1c8b523096b882066c SHA-1: 62ac9f6775a0a47e28f3690d6ef799c2bba9b276 SHA-256: 2df8a6ba5abcdd0b348fb580f748188d79ecfa1fea7626c7bb5a6c2b6e75ab4b
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 used for SEO manipulation or phishing. The primary URL, https://mezovuduw.ru/strik, appears to be a redirector for malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=how+much+ram+do+you+need+for+adobe+premiere PDF link annotation
    • https://cdn.sqhk.co/kigaratak/tA1gjii/prime_video_browser_support.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/jb6TiiY/dungeon_keeper_2_dark_angel_not_spawning.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/JpjjgeI/nijefutilepofilifag.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/R0Sjaz0/stickman_ninja_fighting.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/ifziihs/ruwetajivifuwubop.pdfIn PDF document text
    • https://cdn.sqhk.co/buganisazobu/jhjezy7/97751858350.pdfIn PDF document text
    • https://xapefawisago.weebly.com/uploads/1/3/4/7/134771693/6988233.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/0mtjdT6/12605535740.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/8293302.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/59a4c125-405e-4cbf-a438-a23717e5e2a7/fluke_773_manual.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_6136b5fb2f7f43babbe05f8540570886.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/woderekuda.pdfIn PDF document text
    • https://fdd5f4e0-4443-4821-9021-ce7d41436e3c.filesusr.com/ugd/78c764_ad892e55007c41c0a205691d84770d71.pdf?index=trueIn PDF document text
    • https://8d40832c-2e2b-4284-8151-bb35a16d80ac.filesusr.com/ugd/05d014_7b394545cd7549fd9ddfa84a97f7e776.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/fool_on_the_hill_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sudevejerifu/56323221709.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72f0dbd3-52db-4028-83dc-1a92d28e0008/sunbeam_bread_maker_5820_recipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4afa6177-aabd-469b-999b-1d2b402d84ae/lafuvuzu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48491bd8-7e93-4c6e-bf91-58d1fc9edd0e/72255001628.pdfIn PDF document text
    • https://50aad03f-9d2a-47e6-be13-abd12f321b17.filesusr.com/ugd/3fd638_60e50aae614c483bbfdda81f7d67e8a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/c._h._a._o._s_helicopter_game.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/how_do_i_set_up_my_ooma_phone.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_off0000ee67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE67 5480 bytes
SHA-256: 52f83971021a83da2bb844279e730a8d8974ec9029b1e8a4cd85764795ab21e7
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 10628 bytes
SHA-256: 42ef01edbc049206db6a63c395f995f9cabb8507320503ff6c306652f04d3d36