Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a67b87788f39394…

MALICIOUS

PDF

83.4 KB Created: 2021-06-10 11:29:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ba0dc8ffa0eb76dff6e5b9d8cb7bda SHA-1: 6629ba5497dbb866f6e8119c4448ff59fc34c497 SHA-256: 0a67b87788f39394c050d2058926ab5b58b5956d7a639392d7e7093768083fe2
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing and a trojan. The document body, though heavily obfuscated, contains text related to movie downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://catamma.ru/pbw?utm_term=bangalore+days+movie+download+with+english+subtitles
    • https://veraxoli.weebly.com/uploads/1/3/4/0/134040716/vivakefowarib.pdf
    • https://cdn-cms.f-static.net/uploads/4383170/normal_601096ea92d00.pdf
    • https://static.s123-cdn-static-d.com/uploads/4479688/normal_60b008d1af60f.pdf
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/bulibuvatusokogitibe.pdf
    • https://lolidinol.weebly.com/uploads/1/3/4/8/134884516/963550.pdf
    • https://fugiweritukasuj.weebly.com/uploads/1/3/4/6/134682589/gajuxixosaburodisex.pdf
    • https://static.s123-cdn-static.com/uploads/4417214/normal_5fd081d76024a.pdf
    • https://static.s123-cdn-static.com/uploads/4502245/normal_6008e089a966f.pdf
    • https://bimelubisazabe.weebly.com/uploads/1/3/4/4/134492892/879673.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zubipuwaf.pbworks.com/w/file/fetch/144709965/19687075395.pdf
    • http://depowota.pbworks.com/w/file/fetch/144654786/smart_car_shift_cable_removal.pdf
    • http://jolunatimavu.pbworks.com/w/file/fetch/144707016/92384970620.pdf
    • http://xumamiz.pbworks.com/f/6879020128.pdf
    • http://zejokij.pbworks.com/w/file/fetch/144848895/63456690701.pdf
    • https://uploads.strikinglycdn.com/files/31e54a23-9704-48ff-8d02-c6b50928bea0/81323793111.pdf
    • http://morabef.pbworks.com/w/file/fetch/144588978/79389337968.pdf
    • http://pinurakus.pbworks.com/w/file/fetch/144549228/pizalobulizere.pdf
    • https://uploads.strikinglycdn.com/files/b43c8aab-cbd6-41ab-8281-dc53372bf91a/jekidudenasusedorul.pdf
    • http://zufiwuz.pbworks.com/w/file/fetch/144456384/primark_sizes_big_or_small.pdf
    • http://mujefefimuf.pbworks.com/f/mario_kart_tour_gold_pass_hack.pdf
    • http://nugewil.pbworks.com/f/dependent_and_independent_variable_maths.pdf
    • https://uploads.strikinglycdn.com/files/463fe975-89d4-4b3f-804e-47a2a7aab47a/weber_spirit_ii_e-210_grill_reviews.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_off0001063f.bin
16eedc92530bc30a2a3268cc5d09e25830a11e8710c8d15180741880dfeca58a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063F 5684 bytes
font_01_sfnt_off00011982.bin
7245b7ad52971e93fca3c9a7df5faacae4d3e14e6b2e58f1acd54ff9c0633f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11982 11336 bytes

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