Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb143d9e7287b52…

MALICIOUS

PDF

68.7 KB Created: 2021-01-14 06:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 69cfd6ebdfa5cf1cd0865d7cbea78500 SHA-1: eb2d0964827168bec6a66e06c9dea23f7e12b17e SHA-256: 7eb143d9e7287b52ef8b0f80fd5f19ecb4427b8d94934e9aabc86db9065cdec2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed it functions as a link farm, embedding numerous URLs pointing to disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=dart+board+set+up+distance PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383568/normal_5f970a409f4de.pdfIn PDF document text
    • https://site-1168462.mozfiles.com/files/1168462/2_player_chess_3d.pdfIn PDF document text
    • https://site-1171656.mozfiles.com/files/1171656/golden_bubble_sort_expert_level_63.pdfIn PDF document text
    • https://site-1178383.mozfiles.com/files/1178383/4026834065.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455639/normal_5fb557de0e1ba.pdfIn PDF document text
    • https://site-1178836.mozfiles.com/files/1178836/sloth_meaning_sin.pdfIn PDF document text
    • https://site-1178179.mozfiles.com/files/1178179/tetuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444386/normal_5fc6b82f4f65f.pdfIn PDF document text
    • https://site-1176273.mozfiles.com/files/1176273/demakiwakapigesaro.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/hjjbgjT/rocketbook_smart_reusable_notebook_review.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/megodipewukitoj/alif_episode_2_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/korusetemobizisore.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_off0000cfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDC 5172 bytes
SHA-256: 657906edc59fddcbaaed7ba70872a700dcf9b119b9ab745901a562bc63bf6a8f
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 10772 bytes
SHA-256: 9cf37001fe44033a01cb35da9cb22f3d7d41b49b783fa6fbe0892c6777291a93

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