Malicious PDF — malware analysis report

Static analysis result for SHA-256 c872160373459bb0…

MALICIOUS

PDF

77.8 KB Created: 2021-03-28 16:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 38ccaadb4752eed59d9d2da5e4d105f5 SHA-1: b2b7cbc99e467c0e30e0de773358ec237b7cb643 SHA-256: c872160373459bb0aec0323793cb47187867b3c08c181714b7bc4c0ea1915e5a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful external sites, likely for SEO manipulation or to serve malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/strik?utm_term=diablo+3+wizard+tal+rasha+speed+build PDF link annotation
    • https://cdn.sqhk.co/sotatixorawi/hboi2VX/best_friend_funny_status_video_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jigitovewuk/y8jjwFi/vex_3_game_distribution.pdfIn PDF document text
    • https://cdn.sqhk.co/bofozuto/6mcXqut/lafoxaduvikeduxosalojira.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/gfhdCkW/23073760594.pdfIn PDF document text
    • https://cdn.sqhk.co/kenoramof/ejhtcql/5833859018.pdfIn PDF document text
    • http://kemytbok.xyz/283674993282yxxc.pdfIn PDF document text
    • http://uablog.website/pathfinder_kingmaker_pc_game_manualnmqsd.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/rakaruxarebof.pdfIn PDF document text
    • https://cdn.sqhk.co/pavetikedur/ejg0Clt/tag_faces_on_iphone_photos.pdfIn PDF document text
    • https://cdn.sqhk.co/wiradimabid/nxJigge/cnc_machinist_programmer_job_description.pdfIn PDF document text
    • https://pubedazemel.weebly.com/uploads/1/3/4/8/134870130/polibir.pdfIn PDF document text
    • http://werenntaq.online/where_is_the_sail_switch_on_my_rv_furnacehox4p.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://s3.amazonaws.com/gurupixabogivaz/47585501449.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/rozamagileneki.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/16338722136.pdfIn PDF document text
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_590a6bb915474518a2c8b14c3cee4b70.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/skeleton_template_pathfinder.pdfIn PDF document text
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_57089d47144f4bd4993f0f77cf576f13.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_b890603bbfe345a0b75f88d388102b8e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/dead_silence_full_movie_english.pdfIn PDF document text
    • https://e0ff2378-281a-4ea3-95ae-419c526fdc99.filesusr.com/ugd/0baf77_ee8f7623687540df8252ac4d660d9db0.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 5268 bytes
SHA-256: e674b4e44ef9ccac78bbfe3a44e46aba9ffc8b15f67047f4325c8dfaabdca790
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 10320 bytes
SHA-256: 039114fe00a1271f7ff442cfda8e338758742784218678f6e60ec35f04f913df
font_02_sfnt_off00011c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C55 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c