Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45b733a590519bd…

MALICIOUS

PDF

96.0 KB Created: 2020-11-11 20:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 90686988745865d9aabdf856d3029d0a SHA-1: d2f453c7b977b71c8ee5326b77217c8f86b9fa14 SHA-256: c45b733a590519bde869d9cc141437cae7e97da78846c0cc4b9faf15972eea62
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffset.ru/123?utm_term=global+read+aloud+2019 PDF link annotation
    • https://zirufifun.weebly.com/uploads/1/3/0/8/130874679/95533721c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_5f8b53ca59681.pdfIn PDF document text
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/seloxagul-lexanenorox-tusim.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/pivowa-lirizus.pdfIn PDF document text
    • https://lojawosexofiv.weebly.com/uploads/1/3/4/6/134636472/logelesazofabodig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_5f91f3f6afd3b.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/julaxel/xunosenibizivapaw.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/xevitis.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/14451495641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62eddede-5062-4450-89d9-fc605e76627d/leban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16bbcaa8-4bf8-4cc4-b286-101007ca2200/novena_perpetuo_socorro.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/pokemon_go_gps_joystick_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/jimmy_dean_maple_sausage_breakfast_casserole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15521cea-ca34-47bd-a2ed-215aecd33e8e/veregozirukusexepesir.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/71435123337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f2079c-8b54-47f1-8fe2-e5cc4da5603e/25621569613.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_off00012a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 5292 bytes
SHA-256: a5b5d2f099f51aeb5a128ca8a0328a9b35d3c4c28ce994eebd629005412707d9
font_01_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 3484 bytes
SHA-256: ec4b2ca5634e1f563cfe1b118f4da73cb993c30285f1b21539245732f1252a59
font_02_sfnt_off000149ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CA 12056 bytes
SHA-256: c8373b42a054a9f1af03f756521464bf36b1e5b7f085435b3d1ed8bf35dd83c8

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