Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d97d4beec358fb…

MALICIOUS

PDF

88.6 KB Created: 2021-02-18 22:46:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 616726558c253c3da48c4d31dd3300f3 SHA-1: 2e1b92806f12043e36d6069904dbfcd377dfbbd7 SHA-256: a1d97d4beec358fb578d73624804f18a9cc828ce582fdd5e79dc9b1f97cc58cc
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 by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/aws?utm_term=what+can+i+do+with+a+public+administration+master%2527s+degree PDF link annotation
    • https://cdn.sqhk.co/rogekanus/qhbijie/mukituwepavabo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420441/normal_60086ab837747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423757/normal_601a4ba0b6c5e.pdfIn PDF document text
    • https://ponasamexow.weebly.com/uploads/1/3/1/3/131398296/sewebufanula-vavipuni-zubanudotelod.pdfIn PDF document text
    • https://zaxanedipujez.weebly.com/uploads/1/3/4/5/134582154/tofigitegit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fd8248a11d5f.pdfIn PDF document text
    • https://kazowajobizitat.weebly.com/uploads/1/3/0/7/130775795/balobulo-gimimugirinuz-xevatejaxetavuf-ravalufat.pdfIn PDF document text
    • https://cdn.sqhk.co/tajaketo/GjYwJhe/doctor_care_game_mod_apk.pdfIn PDF document text
    • https://mawuredover.weebly.com/uploads/1/3/5/9/135957038/b98edd.pdfIn PDF document text
    • https://zinorenote.weebly.com/uploads/1/3/5/3/135349773/3615275.pdfIn PDF document text
    • https://regifevadep.weebly.com/uploads/1/3/4/4/134476302/f99fea5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_6011f8505812c.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/cijgcgf/download_sakura_school_simulator_mod_2020.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/vavabi/cdrh_laser_product_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/polyethylene_foam_sheet_manufacturing_process.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/34259108471.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/rrb_bangalore_exam_hall_ticket.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/windows_10_pro_pc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 5764 bytes
SHA-256: 8585297056bb3b4d3d792058f7f558af35c925a7b92fb26d0b718dca3eec35fb
font_01_sfnt_off00012fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 10704 bytes
SHA-256: 60505adb0c44dd1ade89f417526aa4480a2dd3b8ec47a4a6d6d76d4f1a0528c8

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