Malicious PDF — malware analysis report

Static analysis result for SHA-256 561dad7aa0592553…

MALICIOUS

PDF

107.9 KB Created: 2021-02-15 18:53:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0fced058ae0da587be2ea906aa6613fb SHA-1: 20e806f44748a455f8b62c1deabb43eab6434c12 SHA-256: 561dad7aa0592553a37943fe0534282f8aa3705e8c906e7668cc0e7be2267d31
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or known malicious redirectors. Heuristics indicate a link farm designed to direct users to potentially harmful content, with ClamAV and ML classifiers confirming maliciousness. The primary attack pattern involves luring users to external sites through a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=is+push+pull+legs+good+for+fat+loss In PDF document text
    • http://legendarycraft.ru/482144024245v5xl.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/julabapagolilumela.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/hcgi9Vp/liferipuwez.pdfIn PDF document text
    • http://ru-dev.xyz/57128310319gm8yp.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/5543594.pdfIn PDF document text
    • https://cdn.sqhk.co/sugefixa/jliejbm/best_shooting_slasher_build_2k21.pdfIn PDF document text
    • http://samozanyat.info/8411276773ku4nd.pdfIn PDF document text
    • https://tawatoxox.weebly.com/uploads/1/3/4/0/134018263/tijakisekik_jevez.pdfIn PDF document text
    • http://videohost.space/crush_the_castle_2_players_pack_not_doppler2yug3.pdfIn PDF document text
    • https://cdn.sqhk.co/miweguzeg/0ljb2jb/arijit_singh_old_songs_mashup_mp3_download.pdfIn PDF document text
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/legowaladojos.pdfIn PDF document text
    • https://sogitinavebifi.weebly.com/uploads/1/3/5/4/135400198/sukosagir.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/04b0f7c6400a.pdfIn PDF document text
    • https://nerapusu.weebly.com/uploads/1/3/1/4/131438180/90e3a139d889.pdfIn PDF document text
    • https://gunisuzafi.weebly.com/uploads/1/3/4/3/134311694/gipukewovipo.pdfIn PDF document text
    • https://ginekimef.weebly.com/uploads/1/3/0/7/130738874/sabovupum_vutonozebenixad_niluzenazedo.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/jejaSgg/padugekoxemidewejun.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
    • 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_off00015bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BC0 4968 bytes
SHA-256: 2674d50501fd9f935addc5f32dcdd6956909de17ed8e1eb53e3c457d8fbf4f33
font_01_sfnt_off00016cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CBC 11812 bytes
SHA-256: 53410e5127b6befdfd2dee53a18c35c4457a2330f95013048bc24fd113d783a6
font_02_sfnt_off0001943b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1943B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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