Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb294cf9cbad5ed5…

MALICIOUS

PDF

75.2 KB Created: 2021-03-11 16:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eacef24de28b9603c5135b6bca902f9 SHA-1: b4196f2a616f4c5c5be92d335f32249abf0b20fa SHA-256: cb294cf9cbad5ed508cf2068f4a1a9b80faed92a3dc085d36af40cf9bd58a513
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a primary one pointing to 'https://nipisod.ru/123?utm_term=jolly+phonics+words+pdf', suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting a phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/123?utm_term=jolly+phonics+words+pdf
    • https://cdn-cms.f-static.net/uploads/4471959/normal_60171b9ed02a3.pdf
    • http://rubewox.sportsontheweb.net/womejisofepob.pdf
    • https://static.s123-cdn-static.com/uploads/4370055/normal_5fe0ad903e84f.pdf
    • http://wavarev.22web.org/fxn1_e93839_motherboard_manual.pdf
    • https://cdn-cms.f-static.net/uploads/4504788/normal_60102f8cd654e.pdf
    • http://nupewijanetari.medianewsonline.com/over_the_rainbow_sheet_music_free.pdf
    • https://cdn-cms.f-static.net/uploads/4420036/normal_5fd7caffa099f.pdf
    • http://fasuxelatiz.iblogger.org/41951122771.pdf
    • http://vowufijetapiko.sportsontheweb.net/83724734818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dujepav/16989713515.pdf
    • https://s3.amazonaws.com/wupixufekijax/60200025164.pdf
    • http://zusagijumetuze.epizy.com/fexitadobuzazuseku.pdf
    • https://s3.amazonaws.com/lebaxa/94522105614.pdf
    • https://uploads.strikinglycdn.com/files/f3f19903-3b21-4782-8066-bc88175ce1a5/what_is_islamic_architecture_known_for.pdf
    • https://s3.amazonaws.com/fokapikow/car_racing_game_apk.pdf
    • https://uploads.strikinglycdn.com/files/465788a3-4c0f-4dcb-8ec3-5c8b8e2772fd/3872602338.pdf
    • http://wikatamuk.rf.gd/noligid.pdf
    • https://s3.amazonaws.com/litunux/introduce_yourself_in_interview_for_freshers.pdf
    • http://dimizisunope.epizy.com/shortcut_keys_for_french_accents_in_word.pdf
    • https://uploads.strikinglycdn.com/files/7a7964e2-fa9e-4e38-8a6a-320fe422eb0f/14792021882.pdf
    • https://uploads.strikinglycdn.com/files/c849fa58-56e2-4834-8b1a-9b77a3c441f0/universal_studios_harry_potter_wands_list.pdf
    • https://uploads.strikinglycdn.com/files/959caac0-e5e1-4f78-94b7-d7e71da31057/how_to_start_practicing_tai_chi.pdf
    • https://s3.amazonaws.com/dupula/86903546717.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_off0000eac4.bin
8561423faa02249525e54a850a4fc48d02bfc36e2754dac112afc2faadd5c961		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 5216 bytes
font_01_sfnt_off0000fc96.bin
728a1aba57e94a8efb716213ade810d05eb2bc8b319a76adcd96c0e98c77d030		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 10132 bytes

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