Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1791a87e4c763d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-22 22:32:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4adae56d3d8da3130ddce5ffc294ae2d SHA-1: 0ac419544570abdfdb4bcb97b123551165196bd6 SHA-256: dd1791a87e4c763d3cdfa59eac98e57a52fd0a9eb25fced962321039aadbc3bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though garbled, contains keywords related to software downloads, reinforcing the lure.

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://fokemale.ru/strik?utm_term=sketchup+download+free+for+pc PDF link annotation
    • http://mutujejeturuduf.medianewsonline.com/wunovisaxi.pdfIn PDF document text
    • http://puvinizozibejir.mygamesonline.org/86054930987.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CDWhbqq/bamogapewinifusofenarilog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_601b2e3ebb96f.pdfIn PDF document text
    • https://cdn.sqhk.co/bepasasa/pxShcib/17788610434.pdfIn PDF document text
    • https://cdn.sqhk.co/lagolipumepi/Uucghgg/23969201774.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490534/normal_600d8c99a5ee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491436/normal_603de5c45e6bc.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/10853ffe-2c60-4140-a111-f78c5fbd807b/ditupuwijiwukigew.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_32d8806b201748888c887db72d0b8436.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5c95f3-f423-44d2-9efb-9a7bd0317cb1/dish_network_no_sound_on_hd_channels.pdfIn PDF document text
    • http://sarutufasiko.atwebpages.com/wubakozegivinokoxiw.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_4f513b9575a34a5590fc81e15bbabdbb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/105cd071-6bc5-4197-a366-2620249648b5/61530525963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/182f4562-c096-4228-8ee6-89cd409fe9dc/what_is_the_purposes_of_writing.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_982aa5780ffb476eb06cd51b6d69c990.pdf?index=trueIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_72bde07d3c3c407f873cf6e66218cf6a.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_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 5324 bytes
SHA-256: 21f3b4a0c68da96fddffca7cfb9307abfdb5addebad2e87c9124ff7c2de3e7cb
font_01_sfnt_off0000f8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 11100 bytes
SHA-256: a7a56dd1d497aa53554da97cf206be39d59ea313eb66ed38a764715ce13af0f0

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