Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fdfa7f2e3f7926…

MALICIOUS

PDF

76.8 KB Created: 2021-05-21 15:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 972c39bd1ba45fa67f2d07b000684746 SHA-1: 60bb895db3e880c1c607a39d54ee08958677baea SHA-256: b5fdfa7f2e3f7926ed38ec3086d4a773f0ea88ac65eb61ea4baa40db64426ad3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF link farm'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=lista+preposiciones+en+ingles+pdf
    • https://cdn-cms.f-static.net/uploads/4422637/normal_602ef97b74205.pdf
    • https://cdn-cms.f-static.net/uploads/4475859/normal_601ba7d2b3771.pdf
    • https://tuvopezape.weebly.com/uploads/1/3/4/7/134712323/a14c78be81.pdf
    • https://tokatukunopiso.weebly.com/uploads/1/3/4/3/134352811/984198.pdf
    • https://cdn-cms.f-static.net/uploads/4388156/normal_600ef1fa73bb2.pdf
    • https://cdn-cms.f-static.net/uploads/4414161/normal_60498ef60d966.pdf
    • https://static.s123-cdn-static.com/uploads/4459791/normal_60094141dc0e8.pdf
    • https://cdn-cms.f-static.net/uploads/4417986/normal_604b3e7c3da45.pdf
    • https://cdn-cms.f-static.net/uploads/4366335/normal_6055c3494f86a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4a2c7520-52c8-433c-a8ed-d57b89b5e748/87737548507.pdf
    • https://uploads.strikinglycdn.com/files/914790cb-2529-489d-994c-f204e4a70cef/89220395794.pdf
    • https://uploads.strikinglycdn.com/files/21baeede-33d7-4b1c-8a8d-90a4832522d3/travel_bag_on_sale_uk.pdf
    • https://s3.amazonaws.com/fajetufekejo/levoxuluvewofej.pdf
    • https://uploads.strikinglycdn.com/files/ad0ad2ac-d3cd-44a5-962d-1abaf4b06197/11635348047.pdf
    • https://s3.amazonaws.com/zerepuzuze/tartini_devil_s_trill_sonata_sheet_music.pdf
    • https://s3.amazonaws.com/rafiralexezol/harvard_business_review_managing_oneself.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/31591389344.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1d.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 6744 bytes
font_01_sfnt_off0000ed02.bin
441bcaf0fcf6c1f11cb61feb8209885fc39b855edfb077cdee85c55997596cdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 5264 bytes
font_02_sfnt_off0000fef9.bin
f8cf0b60f8e345a367dd817a667e0b5215eafba0c353bf03453ce358fac0a385		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF9 11400 bytes

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