Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe5debaa9bf21c28…

MALICIOUS

PDF

69.3 KB Created: 2020-12-04 05:23:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ca938f4d9416da5e372b10ae3eb88c23 SHA-1: d36aaaab0b6c8403b6fee09b6ee6dc9125037c89 SHA-256: fe5debaa9bf21c287b5609ca5556d542ca782050d2441d660d9b8d5e72ed4141
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 0.9978

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://traffnew.ru/123?utm_term=acton+memorial+library+hours PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5fb5df7e31405.pdfIn PDF document text
    • https://nekarima.weebly.com/uploads/1/3/4/8/134876173/wuvebatakalaraliri.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/5fc5444e8787e8798988a94a/t/5fc8b8e3217b3604ede3425f/1606990052433/super_mechs_game_hack_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d33427a199023ab4f616/t/5fc23aab4e98326c025a63ef/1606564524645/monster_superstar_bluetooth_speaker_price.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe11ccf3de5e49b52bd953/1606291916403/bubble_tanks_4_armor_games.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc00f8e11f6a41984810e13/t/5fc2e2e29d79364840ed6d70/1606607587141/5413888596.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeff03c6ccf69f3238b98/1606283248082/nechryael_superior_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/ludunofebeveda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc47426-d246-4000-b98d-93ea6c2320b6/5886455704.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_off0000bd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD31 5268 bytes
SHA-256: ae9a72ee57cc35dc684e18c5321d23357829bca6290f2185878383a3092cb2c5
font_01_sfnt_off0000cef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF2 10876 bytes
SHA-256: 964fafc378bbdff4bbb7665c28f194cc9a4330403feac641e8647ee2425da72c
font_02_sfnt_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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