Malicious PDF — malware analysis report

Static analysis result for SHA-256 917e734894f75ab5…

MALICIOUS

PDF

66.8 KB Created: 2020-12-09 21:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 27d122f281aced755efe48ae3a9883bd SHA-1: b40669ad87411f4443dae701ca9853e25cf7710c SHA-256: 917e734894f75ab596288aed699abef5056164e015e637ed1dcc2d004d175624
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://trafffe.ru/123?utm_term=x+ray+tube+parts+and+functions', is likely intended to redirect the user to a phishing or malware distribution site. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/123?utm_term=x+ray+tube+parts+and+functions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401555/normal_5fa6cae2b6a11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f9cd3de14682.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/losemojafebus.pdfIn PDF document text
    • https://gimalijuvilonur.weebly.com/uploads/1/3/4/6/134619020/jenumazam_zipigudob_duritizobodis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404528/normal_5faffbd6e015c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503525/normal_5fc552918d0f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe16dd3c6ccf69f326b652/1606293215299/sizerumudem.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/ddo_reaper_leveling_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe034ceaf37e3b6462623b/1606288205033/365934287.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc528438139af037660cc1f/t/5fc77f06a907d7439cdcd758/1606909705182/guess_the_hollywood_celebrity_and_earnings.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2d0d9e5c7695ca9a82108/t/5fc8f8acffd254225cc18242/1607006381100/gun_frontier_free_zombie_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/trilogia_cavaleiro_das_trevas.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0eacbc14dfd36fef1915a/t/5fc27b0e08845d0924da3188/1606581006485/69614039399.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_off0000c958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 5336 bytes
SHA-256: cced759c6e72793c568856c0abfdc7b8b6102b7d3b4cdb03320013594f9efb5e
font_01_sfnt_off0000db8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8F 10248 bytes
SHA-256: 83b43354712829cdc2a7dfafc2bb76e8af6f8cdfe51c692df2a6d2b95c7f9e35

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