Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e39a9d8d8d5240e…

MALICIOUS

PDF

74.1 KB Created: 2021-05-25 01:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a003b3ba40a52e8c8000bd61b7e54b79 SHA-1: 19193fc2364acfc22f6a134626185ee7db8365c3 SHA-256: 7e39a9d8d8d5240e47bce6dc9448f8de652f7a0c079718ea3f41bcb80b431807
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary malicious URL identified is https://jottigo.ru/strik?utm_term=sujets+brevet+2019+guadeloupe+pdf, which is likely used to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jottigo.ru/strik?utm_term=sujets+brevet+2019+guadeloupe+pdf PDF link annotation
    • https://koruguliduni.weebly.com/uploads/1/3/4/8/134896859/8a9aa16443.pdfIn PDF document text
    • https://ninozaji.weebly.com/uploads/1/3/4/6/134690112/kefizeporaxolomigone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369914/normal_6011d636b1c9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365655/normal_5fedd9d00e1c3.pdfIn PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/ad157ccd1d73.pdfIn PDF document text
    • https://kugavulaxux.weebly.com/uploads/1/3/4/4/134454690/sudipazupet-magaki-binifavu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390684/normal_5feb040e6c2c7.pdfIn PDF document text
    • https://putidano.weebly.com/uploads/1/3/4/3/134388569/nasizizet-metavo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfc26cf-94fe-4842-b54a-11a3d04de3e7/aditya_hridayam_lyrics_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39c235f3-fd16-430a-8579-80be0a9990c2/arris_tm1602a_vs_tm1602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169f18e3-f8df-4f93-a0c8-57b84111e68d/age_of_empires_no_cd_crack_1.0c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2876bd-66eb-418c-937c-0350866b527e/54984231143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cfc3c61-7b79-447f-8331-fffd66a48c8c/fume_hood_face_velocity_requirements_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54fea043-65f7-412c-8a28-d0f6b23976e8/29419678078.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/how_much_was_brandon_burlsworth_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e438fb-adf6-44de-a41e-946eef5e309b/wajafulebifozoloviruxuka.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_off0000de13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE13 6068 bytes
SHA-256: a20700b03771ed95b69dcb7a635908273c22b36db7fbb9a17edca9316e2ca514
font_01_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 12028 bytes
SHA-256: 126e5120ff54ac534bb61d875000981cf82cf62529c684a44bb801cbcfb5640a

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