Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f1c0373ecadcfb…

MALICIOUS

PDF

77.2 KB Created: 2021-03-25 07:54:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f27656b85737ab62145ac329438c265f SHA-1: 7ab4a18db46c442459f8454201509849dc6d87d1 SHA-256: 49f1c0373ecadcfbfadd61fea9e28864b2c70bdf928d0a6c286ca545495a728e
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, some of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to trick users into visiting these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://soxebez.ru/123?utm_term=emulator+gba+android
    • http://renawozalor.iblogger.org/78476203560.pdf
    • https://kerizivol.weebly.com/uploads/1/3/4/6/134665291/07be1a.pdf
    • http://romegupemuv.22web.org/computer_basic_course_in_urdu_download.pdf
    • https://zifofuxe.weebly.com/uploads/1/3/5/3/135386801/sefaradada.pdf
    • http://zoradiwa.iblogger.org/que_es_mejor_baumanometro_digital_o_manual.pdf
    • http://dokarukaxita.22web.org/bottlehead_crack_1._1_manual.pdf
    • https://cdn.sqhk.co/movijomo/fM4thaO/galaxy_bowling_alley_grand_blanc_michigan.pdf
    • https://bitoxusimafitaj.weebly.com/uploads/1/3/4/3/134311342/283c70d0.pdf
    • http://bavewemelemare.iblogger.org/23582576575.pdf
    • https://cdn.sqhk.co/zupuguvawaj/ggvgjic/chicken_running_without_head_gif.pdf
    • http://guketaz.iblogger.org/vugajuzul.pdf
    • http://toleritikujomuj.22web.org/gre_big_book_analytical_reasoning.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://motitagododef.epizy.com/multiplying_monomials_and_polynomials_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/45fd7044-af39-4886-a331-5b91e8be01da/how_to_insert_a_built_in_bibliography_in_word_2016.pdf
    • http://jokoligu.rf.gd/4298052024.pdf
    • http://rulegakufokuz.rf.gd/5224941960.pdf
    • https://uploads.strikinglycdn.com/files/31ec5a05-9aa8-40c7-851f-f82467ca79cd/samsung_55_inch_ue55nu7300_smart_4k_uhd_curved_tv.pdf
    • http://kizuwopo.epizy.com/arduino_uno_rev_3_datasheet.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_off0000f054.bin
57dde5768fe4d338286ed9c23b801489e5f612016e5f609aff8fa1e87daaef58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF054 5064 bytes
font_01_sfnt_off0001016e.bin
03273717a20e618caafbaca22e9152456f29b82c6fad7e33113ae62fe0e82ba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 10952 bytes

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