Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd86b746dc5aaf0…

MALICIOUS

PDF

71.2 KB Created: 2020-12-19 12:30:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 43b284ccdde9817b92aebcc09564a94b SHA-1: 6dd4b7d8bafebb0f65dc432d2074e0717d8e6d7e SHA-256: fcd86b746dc5aaf0a9656a45ca34b1708e81eb914a5722def6d3a2ba731fc008
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to market research reports.

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/aws?utm_term=market+research+report+store+reviews PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fc8148ac1703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455376/normal_5fa81e0c5d8e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409098/normal_5fdc25687467a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406208/normal_5fcd36a0ac80b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5fb837d367dfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388629/normal_5f94ec43e91a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488100/normal_5fb82038a9a86.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/4d2976c6-8284-48d0-b5f2-ef0282abb9ec/subway_surf_apk_para_hilesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4bd3cc-a1b5-42fb-9ef9-8ea6d9d42c7b/gebukufizemipikilaxate.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/online_flip_book_maker.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/74377843088.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/brave_sara_bareilles_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/22476606065.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/costing_clerk_job_description.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/verbal_ability_for_cat_by_arun_sharma.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_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 5208 bytes
SHA-256: 8ba651577e238489f6b2b2155def749bbd662f47844ae444cd5ddef503893abe
font_01_sfnt_off0000ede0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE0 9960 bytes
SHA-256: a06072b79376879064b733d9114181f94ce13f997fa6367c8ace2b19099be26a

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