Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fc75c823a9f49ff…

MALICIOUS

PDF

82.9 KB Created: 2021-01-08 23:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6e93f9dce78097b91b7c5c4bc69c7a7f SHA-1: 510526ac50f73e4254e66235f17d012b6a3cf305 SHA-256: 7fc75c823a9f49ffbe1142d54d4011c2c7bcd8a029f6f12f0a2946f705b5771a
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-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://traffine.ru/wb?keyword=dungeon%20keeper%20like%20games%20android PDF link annotation
    • https://zejuvuvegodefi.weebly.com/uploads/1/3/1/4/131453892/jemonitakamimaxikij.pdfIn PDF document text
    • https://wilixutisew.weebly.com/uploads/1/3/4/0/134095986/wavuxerem.pdfIn PDF document text
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/vukefisak-xinimigunuwek-neguk.pdfIn PDF document text
    • https://cdn.sqhk.co/mutexeze/i0icIic/kpop_music_shows.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/0876c29b-06a3-404b-ba07-e1a7216f6bbf/fulefipapegabuj.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/lm358_datasheet_national_semiconductor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f14e0df-5807-4ffa-bf60-4903e381e5e8/lord_of_the_flies_piggy_quotes_chapter_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c67bb36-948f-4ff0-9d61-92b3ffea486d/birdemic_2_the_resurrection_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/enable_3d_photo_facebook_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4932803-341a-4de0-bf4c-6b33d06652f4/vevewiwewapezigubasume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172af5bb-a4e3-4f41-831e-74bb60660256/sofuwavatemuw.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_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 5340 bytes
SHA-256: 464e965059ed020659828dd44ffbe6d2ffb04873c9c1e1f6259e0961e58cc924
font_01_sfnt_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 10880 bytes
SHA-256: fe51deb567a3e860d299304e30116972697b5d9b32532a218d7221b5fd435a43

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