Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45f3aa7db56a086…

MALICIOUS

PDF

73.8 KB Created: 2020-11-25 04:59:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e7c0db1c0f1ac5bfe839f920378ce028 SHA-1: de736705a8f7bfd54b3c7ae4b4fef370cff00598 SHA-256: f45f3aa7db56a08654ca8ecbb9b904192ccd042ebfeb7433c931da86566cdf9d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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.
  • 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://traffking.ru/strik?utm_term=hacked+android+apks PDF link annotation
    • https://xerukarikudi.weebly.com/uploads/1/3/4/3/134316935/susezuja-zebereraxakif-nimamepejit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407313/normal_5fa209557730c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483586/normal_5fa8dca9d796d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/novifamigot/extenze_side_effects_webmd.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/code_red_revolution_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8072c26f-35a4-470e-a33c-df7d91f57f13/lean_in_sheryl_sandberg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65042f3-113d-4dc0-b4ed-e766b1d0ef72/garonikobokazenef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82eaddfb-b36c-4e50-99b5-0c416b73b941/80978922649.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/korean_flute_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/cattell_horn_carroll_theory_of_intelligence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9324019-8ad2-4abd-bacc-1534688d5e83/56679874210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d170fff-01e4-4228-bcb4-449805a2f3a4/joniresaxanexugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b65e21-b6dc-4ae2-b325-be37f8241f88/jeriguzesevikat.pdfIn PDF document text
    • https://s3.amazonaws.com/wusigipufuvowix/32390744493.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B7 5060 bytes
SHA-256: 8f8254f51f6710e46db3b91b84ceba0f0b9c2c1b9bc9208bc1839debe4822f59
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 10336 bytes
SHA-256: 513662956239224ed63ca45c5d0f0b4b5d80ce07eae2cbc951d26687cf42f6e3
font_02_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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