Malicious PDF — malware analysis report

Static analysis result for SHA-256 4446b18229397fb5…

MALICIOUS

PDF

108.8 KB Created: 2021-06-02 22:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1b5c346f242d708b85bb8ebb843535 SHA-1: 9a7c5d88a450850ad600b4edfd9324180b1e2a8c SHA-256: 4446b18229397fb5863f032b57dad7b016813bec7d0ce2b90a3e23514e9d4f0c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a URL related to 'how to get cell machine sandbox mode' strongly suggest a phishing or scam attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=how+to+get+cell+machine+sandbox+mode
    • https://kazusabetife.weebly.com/uploads/1/3/5/3/135318045/reborisuwaw.pdf
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/5448924.pdf
    • https://tobopitoru.weebly.com/uploads/1/3/4/8/134872655/lojixu.pdf
    • https://cdn-cms.f-static.net/uploads/4394062/normal_603fb6052d4fa.pdf
    • https://static.s123-cdn-static.com/uploads/4503987/normal_5ff1ebee864b2.pdf
    • https://static.s123-cdn-static.com/uploads/4491450/normal_5ffd2c9d57838.pdf
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/3630a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d207719d-902d-4710-91e0-efab93e9ecc7/lipuzopalodazivutinivus.pdf
    • http://wufamazajo.pbworks.com/w/file/fetch/144445824/nazaxurixamud.pdf
    • http://detomipipu.pbworks.com/f/proto_germanic_language.pdf
    • http://tiduxikuve.pbworks.com/f/8.pdf
    • http://fuzobonesujo.pbworks.com/f/zofogomijelupelelo.pdf
    • https://uploads.strikinglycdn.com/files/2d811552-c364-4681-860d-ced836c163c2/fish_philosophy_play_activities.pdf
    • https://uploads.strikinglycdn.com/files/f4e1cbd2-7f35-4532-946b-5deeac9b3431/is_a_pack_n_play_safe_for_sleeping_in_newborn.pdf
    • http://gogoporiwo.pbworks.com/f/tokinidagusadifubunuxa.pdf
    • http://wejojixi.pbworks.com/w/file/fetch/144424269/78007567860.pdf
    • http://sepaxebi.pbworks.com/w/file/fetch/144413199/nusibevudodebuxetoli.pdf
    • http://pazimonofe.pbworks.com/w/file/fetch/144463584/english_to_hindi_words_free_download.pdf
    • http://wefolevemud.pbworks.com/f/1694146583.pdf
    • http://risuxujuvu.pbworks.com/f/ver_serie_el_barco_temporada_2_capitulo_4.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_off0001665c.bin
9acdac64f0d945f98b75c5aec26312b6426407a6840b33a73ad3d3de6f2be451		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1665C 5516 bytes
font_01_sfnt_off00017911.bin
8ce20616add06354401942afb19f93e35a6fddaa9c16e6b4c619f7be036c0b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17911 14392 bytes

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