Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa2b9ed2706ef2a…

MALICIOUS

PDF

95.3 KB Created: 2020-12-23 10:20:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 50df5115e14f79f5d3f87eadbdde62a6 SHA-1: 2bce9e804ba2deda9f93df548f58676f564c33bc SHA-256: cfa2b9ed2706ef2afee24186d701f5d0356ffc2c3d561514e3d569b8ef6cbfaf
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a suspicious domain, likely for credential harvesting or malware delivery. The document body is heavily obfuscated and contains what appears to be metadata from the wkhtmltopdf tool, suggesting it was generated programmatically to host the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://traffnew.ru/123?utm_term=federal+indian+policy+effects
    • https://cdn-cms.f-static.net/uploads/4387817/normal_5fba94bb482b3.pdf
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc7c563b183f.pdf
    • https://cdn-cms.f-static.net/uploads/4496815/normal_5fda59651b652.pdf
    • https://static.s123-cdn-static.com/uploads/4385852/normal_5fdd306273cb6.pdf
    • https://cdn-cms.f-static.net/uploads/4374953/normal_5fc168e90d682.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xovekolamoxe/simpsons_season_16_episode_guide.pdf
    • https://s3.amazonaws.com/pajukovuxetu/american_express_confirmed_card.pdf
    • https://s3.amazonaws.com/zosevid/kutumiwapexexifuvapodet.pdf
    • https://uploads.strikinglycdn.com/files/437a6a00-bfcc-496f-b42a-9e405beb06d5/joe_budden_all_love_lost.pdf
    • https://uploads.strikinglycdn.com/files/36683672-c618-4cc0-91ea-1eff88def511/72120273302.pdf
    • https://s3.amazonaws.com/baxunaf/84994489106.pdf
    • https://uploads.strikinglycdn.com/files/20294f71-6af4-4579-8614-17a646349a4d/80673881108.pdf
    • https://uploads.strikinglycdn.com/files/01518ff9-3b0c-4aa4-9935-cfe9dc362f23/wireless_subwoofer_kit_review.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013530.bin
28f95802937283461a676ee588a9f946792ec8ca769983b312db47e027952965		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13530 5204 bytes
font_01_sfnt_off00014704.bin
f24bb26e366db19e6845a5a0798559622ea90d95e56f4462c7b7d895bcc215b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14704 12820 bytes

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