Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dc7d8e6e63bed7…

MALICIOUS

PDF

75.1 KB Created: 2021-03-27 14:58:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 83e382b430222d13d0c3d9e37f278ef2 SHA-1: 65431366932fc9b1b831905b25c83518ec6d2cff SHA-256: 77dc7d8e6e63bed7fab4bc17817abfd2d8e245491c2fb8bc0afba8baa68608f7
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

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://lozipotod.ru/wix?keyword=k%2527inich+yax+k%2527uk+mo PDF link annotation
    • https://ralanuda.weebly.com/uploads/1/3/0/7/130775203/pamulenilupilujefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_6014c10680b04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527237/normal_6002423f78531.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/dujogufefun_ganuwomiduvewax_sujigogumovor.pdfIn PDF document text
    • https://pumejikugo.weebly.com/uploads/1/3/0/9/130969330/sikagogorepimon_didebol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457006/normal_5fd0758198c77.pdfIn PDF document text
    • https://dofigova.weebly.com/uploads/1/3/0/8/130813881/5dec9f273d01.pdfIn PDF document text
    • http://ninuxalezopo.getenjoyment.net/qualmark_assessment_criteria.pdfIn PDF document text
    • http://vogolimipogusoz.mypressonline.com/ketiwipufaxisudugojekovag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_605c68fa33d79.pdfIn PDF document text
    • https://budovatepita.weebly.com/uploads/1/3/1/3/131398204/wizasigudepu.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://uploads.strikinglycdn.com/files/c38e52e7-be1b-4b68-adac-392e38d73bec/quadrilaterals_and_coordinate_geometry_worksheet_answers.pdfIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/architecture_firms_in_chennai.pdfIn PDF document text
    • http://zodofujeki.atwebpages.com/sekaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3051e727-be5c-43cc-977a-b978d553ba36/developmentally_appropriate_learning_activities.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_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 4652 bytes
SHA-256: a840689643323d5a0a9a3f4e7f07f0b59fbe91652996c2407eb7d446428e100c
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 11760 bytes
SHA-256: 36a037e971ad8c21167690de7fda8882d9941e50f83138e6f352282170373831
font_02_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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