Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ac834a8e3bf0f9…

MALICIOUS

PDF

80.6 KB Created: 2021-03-10 17:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d008697a60c608c390c53c19a3529918 SHA-1: 2960b359eec108f21b6dc42b7296cd8a77021e88 SHA-256: 25ac834a8e3bf0f99043ffb28dfdced254d3e447d5d2691c1be78df7f49f6bb9
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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://dafemum.ru/strik?utm_term=stihl+cordless+mowers+reviews In PDF document text
    • https://cdn.sqhk.co/mofijovelu/UgfggH5/61605192993.pdfIn PDF document text
    • http://pl50off.info/adding_and_subtracting_fractions_practicek31sj.pdfIn PDF document text
    • https://cdn.sqhk.co/kagitenoru/cb12Pji/rojefogebonetiv.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/hY94ihY/yellow_gold_apple_watch_case.pdfIn PDF document text
    • http://fit-italy.space/how_to_program_genie_pro_stealth_garage_door_opener58vsw.pdfIn PDF document text
    • http://zitokik.iblogger.org/5412432470.pdfIn PDF document text
    • http://fuckfrsky.com/32772586831savre.pdfIn PDF document text
    • https://xukotonaxi.weebly.com/uploads/1/3/1/4/131453431/a7d79e1297586c.pdfIn PDF document text
    • https://karumevupux.weebly.com/uploads/1/3/4/3/134390130/xevenokexam.pdfIn PDF document text
    • http://easylearning.space/71179528982ltpy8.pdfIn PDF document text
    • https://cdn.sqhk.co/wikepijosipi/Ahcsib6/wajemidojo.pdfIn PDF document text
    • http://fruitik.space/lukilizajiwyz4d8.pdfIn PDF document text
    • http://jubemexor.22web.org/68687713573.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://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_398e7c7195254fa4bf0e53e4d9249f5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/96730564-4579-45c5-997e-ac11b73be4fc/dejozusaxomotadunemafazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6fb32db-b241-4737-a6fe-6362022d54eb/what_are_the_theories_of_learning_in_educational_psychology.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_af7523a31d6248469f191c4539bbfa6f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/331b0774-f703-4cb5-a2ec-ffe322aa0486/suddenlink_universal_remote_tv_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0894c97c-3291-41ef-b6c1-6fe4b12a4072/zavuvilefujer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4e610e-00dc-4a53-b0ad-d2698a33af2b/89398794109.pdfIn PDF document text
    • http://gizenelik.rf.gd/stoke_newington_sixth_form_ofsted.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 4908 bytes
SHA-256: d61a9a63ffaa5b13f28390a82619204c3e4428c1fc38991830e931b467cd92af
font_01_sfnt_off00010196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10196 10912 bytes
SHA-256: b199ef72d349efe581f7ffc627fe05e57abead03c7305c8dd313624fc0cab022
font_02_sfnt_off000126be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BE 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34