Malicious PDF — malware analysis report

Static analysis result for SHA-256 2853e0e79f127218…

MALICIOUS

PDF

67.8 KB Created: 2021-01-17 03:42:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81af2597e32b0aed74c7fb15a807e752 SHA-1: d49864de9569d7e752adfb7dbd43778dc833c24f SHA-256: 2853e0e79f127218acb3bae4d4d9c80f89ea4ede8300a200a87f9a0cb7f8cf75
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. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination or purpose of the links. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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=minerals+that+contain+carbon+and+oxygen
    • https://site-1172834.mozfiles.com/files/1172834/download_gif_live_wallpaper_pro_key_apk.pdf
    • https://site-1172169.mozfiles.com/files/1172169/57867991158.pdf
    • https://site-1180155.mozfiles.com/files/1180155/general_electric_refrigerator_repair.pdf
    • https://site-1175466.mozfiles.com/files/1175466/rab_na_kare_babbu_maan_song.pdf
    • https://static.s123-cdn-static.com/uploads/4450347/normal_5fe0c9e2c8e4a.pdf
    • https://site-1172364.mozfiles.com/files/1172364/mp3_music_player_online_shopping.pdf
    • https://wawumojobov.weebly.com/uploads/1/3/5/3/135323155/b0d8102b5df36ae.pdf
    • https://pilopumif.weebly.com/uploads/1/3/4/7/134733378/muvosomijitade.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gulapore/nivejisezaninuxif.pdf
    • https://s3.amazonaws.com/naxozelozude/glaucoma_diagnosis_and_management_nice_guidelines.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc4.bin
9e30520bc73820e7c596b4e88c8467f86437e4f4038d586c5c26c192294492a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 5516 bytes
font_01_sfnt_off0000de8b.bin
727785b49e7c4c42086ba5ee21fbd86185d20ba05663bf7d9edb4cdd451b5600
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8B 10668 bytes