Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e66899b2c59c7c…

MALICIOUS

PDF

85.6 KB Created: 2021-04-11 06:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0955af2fc6218e42acd6bd70b801e59e SHA-1: 575574976b8324c514c9610ad0a9da9a4d10008c SHA-256: 71e66899b2c59c7c00dc41c8890fccbd62da0ab1fceea822f08126f6c38f55ad
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://nipisod.ru/strik?utm_term=2019+ford+mustang+gt+convertible+specs PDF link annotation
    • http://fosexodepaga.iblogger.org/english_grammar_book_bangla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_600e27732b9bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393483/normal_601a390dcc0cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481417/normal_5ffcce37b3c4e.pdfIn PDF document text
    • http://nosaraxes.22web.org/online_math_worksheet_for_kindergarten.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426955/normal_60498360b13b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381321/normal_5fe2e43b4bc1c.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/zukogi/selenium_cucumber_javascript_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/ponivotigegepub/13573520643.pdfIn PDF document text
    • https://9d76d0c6-5807-43ac-a2ba-7b4112d1a20a.filesusr.com/ugd/5cd33b_d08e2e559123461c81d58da8e1d10779.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/alveolar_osteitis_management_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/best_offline_action_android_games_2019.pdfIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_2ddae4cc082243f7a013bf552712100f.pdf?index=trueIn PDF document text
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_440a6702e9c841c793dce6f67ac82071.pdf?index=trueIn PDF document text
    • http://monudaduxafe.epizy.com/how_were_the_southern_colonies_governed.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/affliction_warlock_3._3_5_pvp_guide.pdfIn PDF document text
    • http://lekirajadu.epizy.com/barcarolle_duetto.pdfIn PDF document text
    • http://lidumadinub.epizy.com/arduino_mega_2560_projects.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/63916590394.pdfIn PDF document text
    • https://s3.amazonaws.com/bisazabe/51958262601.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/33359313751.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/android_camerax_camera_view.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_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 5944 bytes
SHA-256: 6251be791aac06b82e06a86a906299679960fec112dcad2cbdd770ad6c3a847c
font_01_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 11400 bytes
SHA-256: 00954f997c12394541617028eb53e313624c6b7907dd1e9fc73f2bd2f60f9482
font_02_sfnt_off00013a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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