Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7db8f3e518df57…

MALICIOUS

PDF

77.4 KB Created: 2021-03-22 15:10:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9d0258670110844de3df98ed81c81781 SHA-1: b1d0c18f3182ede14929f54d979514ba3c44233a SHA-256: fa7db8f3e518df57bc4b5a91f9a0706490893c4d87bf112f787accda77a6e31b
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 0.9998

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 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://jumiwimov.ru/strik?utm_term=what+do+you+understand+by+social+impact PDF link annotation
    • http://gitikirazidapi.medianewsonline.com/asko_f12_error_dishwasher.pdfIn PDF document text
    • http://hisgohar.site/agrobacterium_transformation_in_plantsvikmr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486041/normal_6005d3fda1e97.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/nanifojivajiju.pdfIn PDF document text
    • http://fezufizibum.mypressonline.com/56600791699.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/4749427.pdfIn PDF document text
    • http://laithub.pro/how_to_program_a_hunter_sprinkler_controllermmj1h.pdfIn PDF document text
    • http://tuzojexis.mypressonline.com/certificate_of_origin_format.pdfIn PDF document text
    • https://ridawixesij.weebly.com/uploads/1/3/4/6/134660161/11f20020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_604701532a415.pdfIn PDF document text
    • http://katermore.ru/administering_medications_via_enteral_feeding_tubeqih5h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382627/normal_5ff70c021fdff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416331/normal_60481c83226cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388835/normal_5fc7c3b136247.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/ca7b608d-46fa-4ed3-aa86-f1a5ff44542a/pmbok_guide_7th_edition_pmi.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/karutamurexadadakadofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa62525-e46f-4c32-91d5-cc85cc14afd8/39696081066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35ffb674-60d0-4e2b-a372-f61284fbe7e2/18383284283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b7cfee-fe71-4a77-ade3-c5a646c9034b/bomegipida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a54c8f-016f-44e5-88d5-8ab2360fa169/livopavopuvujenugokawu.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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 5568 bytes
SHA-256: e6d76cdb40990edca73d9e6b62472364c9de93592cc361c5b3e47ab634d903fd
font_01_sfnt_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 11032 bytes
SHA-256: e2b36118743131ad6c7bdc35337574311a1af2eac203bf1cbd7642ab5e41f750

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