Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2cf00a2b8fdfa0…

MALICIOUS

PDF

68.2 KB Created: 2020-12-16 23:41:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4adfd30dfe6a25a102c179b4494a09c8 SHA-1: 79005d2b7103d91f3397051250df71e09859ba50 SHA-256: cb2cf00a2b8fdfa08f78e28141eb921575b35e581e87f0d419dba98f6c9ed01a
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to malicious 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=unblocked+games+pacxon In PDF document text
    • https://wavutokemik.weebly.com/uploads/1/3/4/3/134309613/govewalasatak.pdfIn PDF document text
    • https://worowisirokisid.weebly.com/uploads/1/3/4/8/134856274/debugeduto-dexafigizin.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/28bfb.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/4d2f636fd3e.pdfIn PDF document text
    • https://gusobenatidisa.weebly.com/uploads/1/3/4/4/134475091/robotuputujalaxa.pdfIn PDF document text
    • https://gutasoleniv.weebly.com/uploads/1/3/4/4/134481560/puwuretovabomogu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0e01f2cf09257bd6be9c2/t/5fc380174f983757204cd18d/1606647832925/blue_cypress_lake_fishing.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e7ad6609fd0ee79153f2/t/5fc16646e18c5c478e307253/1606510151212/siwelisamugolabonixib.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc29ae5bdb33045eecd1eec/t/5fc3946beaf37e3b640a7122/1606653036312/linear_function_word_problems_worksheet_8th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd449d3-10db-4762-8e50-a55ed016c8a5/assassination_classroom_parents_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc777f5a3ccef3526eb9256/t/5fd741e6c4373837b926fc90/1607942631802/jovuwivewurigixare.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/6703712046.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290217ee-7d75-4dcb-acbc-61fe3202417f/bazobegijuxejefewejugimov.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_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 5560 bytes
SHA-256: 2f752617a7c45e35f2c3ee140b9d8e6ab36f35df49975eb6a9029351e9b3670b
font_01_sfnt_off0000df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6D 10956 bytes
SHA-256: c10125f5aa8a4cde71c67b990890cc714923d1a3173d4b6d176b920abb5f4ca0

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