Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c495851f56741c…

MALICIOUS

PDF

81.4 KB Created: 2021-04-23 03:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fc247034a9f63042ad22e8e508bbd44e SHA-1: 2481ddb1ea22777d39b8deacdc9ce310a76808c2 SHA-256: 33c495851f56741cdd1f2acdf715d20e76f88c717f6e664bbf04ce1a51290a88
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and is flagged by ML classifiers and ClamAV as malicious. The embedded URL `https://xajibur.ru/strik?utm_term=how+to+clear+up+skin+diet` is the primary indicator of malicious intent, likely leading to a phishing page or malware download. No scripts were extracted, but the PDF structure and external URL suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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://xajibur.ru/strik?utm_term=how+to+clear+up+skin+diet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413585/normal_600d6d2c2f97a.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwuxa/jijgggi/78498527742.pdfIn PDF document text
    • https://cdn.sqhk.co/pekobenew/cp6aSgX/jump_start_car_battery_pack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406463/normal_60672e9420313.pdfIn PDF document text
    • https://cdn.sqhk.co/lululitoj/hhihgjj/fun_charades_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/jagfPeN/47272707545.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/bii59gg/uc_browser_mini_apk_download_latest_version_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/pemejitala.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/keguziturusoz.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/zatololoxoniruxapukos.pdfIn PDF document text
    • http://balusazirifid.rf.gd/alquran_online_mp3_indonesia.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_88686c1a298f4f308f25d4795e09295e.pdf?index=trueIn PDF document text
    • http://sebukojuteropib.rf.gd/worinuxokuguxedekomuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea277756-fe26-4a1a-b6d1-bd2edbddbd66/cooks_coffee_maker_12-cup_programmable_manual.pdfIn PDF document text
    • http://potefedezazox.rf.gd/broadcast_journalism_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d942b69b-6be1-46f0-9c6f-323bca4fd35a/how_do_you_sync_a_serta_adjustable_bed_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bec310-2377-48a1-b914-32ffb5ea323c/9454567366.pdfIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_a0a85de5f8014d1ca013fa95e89e89fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/kumoxazefawekatafaronod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd84df8-29b4-4d11-91cd-9a37e190d69d/how_to_program_intermatic_timer_st01k.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/mimowuvazumapifomuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5756ed80-41f2-40b5-9c67-22da9bbb22be/nijiganitedufowixofiwejob.pdfIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_482ad95d375e43e88207b6dd10ed1923.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6E 5184 bytes
SHA-256: ba97d91659ccf077fc8bb301037aaff21b69c693bcafb2d0901049159f48eb44
font_01_sfnt_off0001112d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112D 10984 bytes
SHA-256: 2701f30ad9f3d96085d1e1d868e8e7ba2896b006b740e44efbfd04c11722a855