Malicious PDF — malware analysis report

Static analysis result for SHA-256 2263b632e968eeaf…

MALICIOUS

PDF

69.4 KB Created: 2021-04-04 08:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f05ff262aaaffdee4b4190a3349e161f SHA-1: 75bcf6804890730c98668fdc4f3f98dfca1a036f SHA-256: 2263b632e968eeaf6fa3149a37fe617adcfd8559a3f7eb272f5b174681f154a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to domains that appear to be part of a link farm, suggesting a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the presence of numerous external URLs points to a redirection-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://zajinet.ru/wix?keyword=mole+calculations+worksheet+tes
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/gumigikeriw.pdf
    • https://cdn.sqhk.co/sekijebasazi/gIhBEjg/46014520768.pdf
    • https://cdn.sqhk.co/vomofizog/Jic8Ijd/football_manager_2018_apk_hack.pdf
    • https://sopidafepu.weebly.com/uploads/1/3/4/7/134744384/tizeromosuva_sunep_dexolinu.pdf
    • https://cdn.sqhk.co/geroterunetu/jXuyAjg/xejujezu.pdf
    • https://pufokebisuniga.weebly.com/uploads/1/3/5/3/135324869/wolajoje.pdf
    • https://nifilova.weebly.com/uploads/1/3/0/7/130740060/4003529.pdf
    • https://puxorubawi.weebly.com/uploads/1/3/5/3/135349856/4642382.pdf
    • https://niwezeruzebunol.weebly.com/uploads/1/3/5/3/135387699/6885688.pdf
    • https://cdn.sqhk.co/ruzesowasu/58u1Tjj/carrom_board_game_carrom_online_multiplayer.pdf
    • https://kiteginizi.weebly.com/uploads/1/3/1/8/131871518/nogesu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_05c885aa47354b24a330446c4e02c277.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb19cc0c-3a7c-44ed-924e-fca8444e6d7a/kangertech_top_evod_starter_kit.pdf
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_a3aede06ef9c40cea27671985e6ffb32.pdf?index=true
    • http://fukokikedusej.epizy.com/hadronox_denied_guide.pdf
    • https://uploads.strikinglycdn.com/files/7210912f-9f78-4567-886a-6b6cf5fd9f7d/what_are_3_forms_of_identification.pdf
    • http://jojomuge.epizy.com/mitinuremawajowoxeg.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_off0000d427.bin
9812cf9e2b0866672c4cfcbb8e2765cee51cacfbf89bd212333f42d337f072f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD427 5048 bytes
font_01_sfnt_off0000e56b.bin
f450b7f0c9e35efc876b84ecd59efdd800fe33de13e2c7b777b480d888e52e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE56B 10224 bytes

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