Malicious PDF — malware analysis report

Static analysis result for SHA-256 583429ac42b8c223…

MALICIOUS

PDF

78.0 KB Created: 2021-03-18 18:36:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6338f413b0df03d83ff025b036fce2bf SHA-1: 5c393aa1c6fa29902e56d13a2731d7cec5403921 SHA-256: 583429ac42b8c223a1d7f1eef45ee929a43002d00f7ea2f7f12c5ddf6b3d82c3
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'ponafet.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to educational worksheets, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=punnett+square+worksheet+high+school
    • http://phtech.site/a4_graph_paper_1mmcmbeo.pdf
    • https://cdn.sqhk.co/duponetix/dRhajd1/infinity_loop_premium_mod_apk.pdf
    • http://bhd-management.space/9816211169226st0.pdf
    • https://cdn.sqhk.co/neseleko/hihgNoT/jack_adventures_in_odyssey.pdf
    • http://nigemutekilum.mypressonline.com/1103488353.pdf
    • http://teachost.com/built_like_a_badass_defrancoqrhuk.pdf
    • http://vetobiz.sportsontheweb.net/what_is_the_default_username_and_password_for_a_hitron_router.pdf
    • http://zuxekagapefe.mygamesonline.org/12151777588.pdf
    • http://zoguponuwuxoli.medianewsonline.com/6301608482.pdf
    • http://worldworkbook.com/xolixokifewezupizegimvrj7w.pdf
    • http://pirewarekow.mywebcommunity.org/does_alexa_work_on_roku.pdf
    • https://cdn.sqhk.co/rijomawonuj/ihgdhai/free_video_call_for_android.pdf
    • http://lemakomude.sportsontheweb.net/bojisewanifa.pdf
    • http://zawugudumi.getenjoyment.net/lunoropixu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7b3f0950-5a6a-42ca-9c96-ff28ab96751c/46786528153.pdf
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_768af9b99f0641bb83596a88695fd48e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/87199af0-b955-474c-9c11-0b0f18c7da0c/starting_your_own_podcast_network.pdf
    • https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_4588b9fa2f1547a7990db1b3026bb6c1.pdf?index=true
    • http://zutugidod.onlinewebshop.net/denon_avr_1712_manual.pdf
    • http://bebojivim.myartsonline.com/padesa.pdf
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_424bb612e8004baf82e99f103f0eb603.pdf?index=true
    • 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_off0000f379.bin
04b09344dcf66153b43c6dc5c532b9ca7de5ccfb1c067f702b75d4774137da0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 5344 bytes
font_01_sfnt_off000105b8.bin
f280cbca4394968e1393d3fe8708398de5cf9f92155c288ec17031a29ce54b3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 10608 bytes

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