Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45a41b05fc9f19f…

MALICIOUS

PDF

75.3 KB Created: 2021-01-14 23:50:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a82c5c6838d5d36f2256d615a87589e3 SHA-1: 755da2727c5fc213408c4ec0fe84ee172a15e38b SHA-256: c45a41b05fc9f19f7ccd169ab3317c9895634d23aff4d10da652c263cdb2ea44
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=arikil+pathiye+song+karaoke+free PDF link annotation
    • https://cdn.sqhk.co/mebereserab/ymgdii2/38515125008.pdfIn PDF document text
    • https://site-1168029.mozfiles.com/files/1168029/81244815084.pdfIn PDF document text
    • https://site-1195801.mozfiles.com/files/1195801/kuwaxomovelosulovogopelo.pdfIn PDF document text
    • https://site-1172267.mozfiles.com/files/1172267/kesiragutidorememikeg.pdfIn PDF document text
    • https://site-1178049.mozfiles.com/files/1178049/zalogewezuketopozi.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/ebdgikh/pirates_of_the_caribbean_pirates_dice_game_instructions.pdfIn PDF document text
    • https://site-1176512.mozfiles.com/files/1176512/cute_halloween_costumes_for_teenage_girl_diy.pdfIn PDF document text
    • https://cdn.sqhk.co/webepinovet/2VK88jd/vuzojumawisigub.pdfIn PDF document text
    • https://site-1178784.mozfiles.com/files/1178784/92150719867.pdfIn PDF document text
    • https://fujamimoxelak.weebly.com/uploads/1/3/4/6/134601663/3909665.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/bulujono/letter_names_and_sounds_worksheet.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_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 5320 bytes
SHA-256: c99ac1f1329e3c45aad5651327d8e3d26e6ac83374879895cc276da8a59f6eb7
font_01_sfnt_off0000fb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB89 11032 bytes
SHA-256: 30ced001d1d57743ec3636f172cd6d286714c4c82da704e29f9d21d260f00bf4

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