Malicious PDF — malware analysis report

Static analysis result for SHA-256 31900be9ff24100b…

MALICIOUS

PDF

73.7 KB Created: 2021-03-19 22:49:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c9cf80ab5046d8f21d4066ff6a02a06c SHA-1: 57d34b03b606de1fb4cd6c21b8dbdfd5278b987a SHA-256: 31900be9ff24100bee5d7125f200815d3e4b39d1ae1203020d4e2d4fd936750a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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 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://baarspo.ru/strik?utm_term=elder+scrolls+arena+download+64+bit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468267/normal_6036c107be312.pdfIn PDF document text
    • https://rigivopamakor.weebly.com/uploads/1/3/4/8/134869382/nubawukudeneraba.pdfIn PDF document text
    • http://vutunema.mypressonline.com/types_of_computer_programming_languages.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383702/normal_5fcb61a31713a.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/Whahjgf/animal_radiology_technician.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/9VEcDhj/33253788996.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/6182518f6f.pdfIn PDF document text
    • https://vibomasovig.weebly.com/uploads/1/3/1/0/131070198/kikulu_sazadojep.pdfIn PDF document text
    • https://xifuvago.weebly.com/uploads/1/3/0/8/130813557/vakove.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483354/normal_60064a1d17ca2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5feb38781e538.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_603ff403e9f52.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/jotibe-dunurisuwogotu-gibuxuzom-turogijuje.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/cjjxjg1/tewusi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476446/normal_602abacda7a1f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_b751eb0a43fd44f981530f43e2e04802.pdf?index=trueIn PDF document text
    • http://satogitexuvo.myartsonline.com/99283041212.pdfIn PDF document text
    • https://92ddf5cc-4ce7-4caf-b117-8241c553a727.filesusr.com/ugd/42bae0_0983c93df0dc4212a33eb3c3fb687128.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_94e82cfa8e3b4cf683201cce053495cf.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_7e87795519f147a8978c6ffe45075ac7.pdf?index=trueIn 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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 5364 bytes
SHA-256: 51cb0ac1869e507541fd5ca8611fb53055634b64b4bd880ff7b10ef58dd5f46e
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10864 bytes
SHA-256: 8a294c08c17d355aed0c0f3c7f25843b0b530a8421009cc8d6409b2f3ee9dc4c

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