Malicious PDF — malware analysis report

Static analysis result for SHA-256 3778921b023cca72…

MALICIOUS

PDF

79.7 KB Created: 2021-03-24 17:26:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73b513fd2e08448d302ebcda34182c45 SHA-1: d6bb6c249c5ea6ba4389b685b602ed51dcdeff0c SHA-256: 3778921b023cca725e612d147543403b82b56283e296f46ad33ea1749e9fa86f
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which are part of a link farm designed to improve search engine rankings. One prominent link leads to a malicious domain, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=prescott+harley+and+klein%2527s+microbiology+9th+edition+pdf+free+download
    • https://cdn.sqhk.co/favosejo/jajjyid/charmed_kampf_der_titanen_schauspieler.pdf
    • https://cdn.sqhk.co/noneniwetav/hiiDejg/gofebudelemerimukas.pdf
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5ff64aba5c43b.pdf
    • https://cdn.sqhk.co/jisujesox/dgdxOji/zilujasapotugomazax.pdf
    • http://dimozakebaba.scienceontheweb.net/96481412721.pdf
    • https://cdn.sqhk.co/zidulibu/bx3hdie/negoku.pdf
    • http://rixorevu.getenjoyment.net/tuzetebunozasadej.pdf
    • https://cdn-cms.f-static.net/uploads/4406170/normal_5fea003298aa5.pdf
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5ff11bd83fd50.pdf
    • http://kamikofonem.mygamesonline.org/catching_fire_movie_script.pdf
    • https://cdn.sqhk.co/gesokusa/gTxibib/watch_with_friends_hulu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6ed3983-7bba-4881-9972-c54919a4f9b8/que_causa_la_trombosis_cerebral.pdf
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_41e20fe72eba4505879df9fe828e821e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5e6bf2f-7325-49e4-9cb6-29f41409b842/86629945048.pdf
    • https://uploads.strikinglycdn.com/files/94614039-ca97-4946-ba79-f5aaa851ba48/john_deere_265_mower_deck_manual.pdf
    • https://uploads.strikinglycdn.com/files/0ea0712a-1fe4-43a0-9fff-619319ac39df/multiwii_gui_2.2_download.pdf
    • https://uploads.strikinglycdn.com/files/6e9f03db-fef2-4cae-9632-6035ec9a8064/how_to_resolve_conflict_in_the_classroom.pdf
    • https://uploads.strikinglycdn.com/files/8dc24e4e-7f22-4ba5-9227-5f1d47a72bf3/24703091795.pdf
    • https://uploads.strikinglycdn.com/files/724badb5-f301-490a-a7ce-2f471ab3048c/tajenaxifovazavekawirosas.pdf
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_75d6382aa7ae4abe807ea5a86f54c307.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8b634d07-0470-4bea-b797-3f0a489a3bb6/maytag_bravos_xl_washer_mvwb850yw0_parts.pdf
    • https://uploads.strikinglycdn.com/files/bd4e9a7f-9f9d-4ef0-a3c0-edfa8acfa787/28564821009.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_off0000f569.bin
20907bfae204bcbd3d486e59dcef83c5a9c80830930cdc1ffe64af06b000f954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF569 6156 bytes
font_01_sfnt_off00010a51.bin
8677df003df604afc6a9995ca97243d8dcd6ee23c183a5f02dfa1723efa865c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 11224 bytes

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