Malicious PDF — malware analysis report

Static analysis result for SHA-256 86be4fa1c2ebcdf4…

MALICIOUS

PDF

79.4 KB Created: 2021-03-13 13:24:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3af859a212e98122a1e7815d6d82a0c SHA-1: d1d796a15072c4dd7b4bd36fe1bcee4f70cf2cab SHA-256: 86be4fa1c2ebcdf44529a3eeed2009baf78c87f4c1b002e370459b7508eb67fc
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, and is flagged by ClamAV as a phishing trojan. The embedded URL 'https://lozipotod.ru/wix?keyword=osrs+firemaking+guide' and the first link in the farm 'https://cdn.sqhk.co/mobirewin/ekQhhid/what_form_of_government_is_australia.pdf' are suspicious. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=osrs+firemaking+guide
    • https://cdn.sqhk.co/mobirewin/ekQhhid/what_form_of_government_is_australia.pdf
    • https://cdn-cms.f-static.net/uploads/4385631/normal_601672645190c.pdf
    • https://cdn.sqhk.co/luwesefizi/djcPFgi/happy_wheels_hacked_online_games.pdf
    • https://static.s123-cdn-static.com/uploads/4365655/normal_60027df170d11.pdf
    • https://cdn.sqhk.co/nilofixogezu/spgjgjN/best_camera_mod_apk.pdf
    • https://cdn.sqhk.co/babijuvawov/67Obidf/vavanodedabijoxaxajota.pdf
    • https://cdn.sqhk.co/kosadara/bhghfha/humraaz_songs_webmusic.pdf
    • https://cdn.sqhk.co/pixafosabow/8zx8IGC/woodbridge_crossing_restaurant_lodi_ca.pdf
    • http://fozixozag.iblogger.org/6034365692.pdf
    • https://cdn.sqhk.co/kizewetete/jghi23z/7512228697.pdf
    • https://cdn.sqhk.co/takejirasomu/gjjdKmo/surakaxakobamirosew.pdf
    • https://cdn-cms.f-static.net/uploads/4467926/normal_60393d0fdf196.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://52468903-0e2d-47c5-babb-61e1d305d291.filesusr.com/ugd/32777b_27a651984be74fd98bb28859df237ed2.pdf?index=true
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_395435ace1634141ade72ad26b5a0028.pdf?index=true
    • http://wemojeduxikuzem.rf.gd/poulan_chainsaw_p3314_instruction_manual.pdf
    • http://tewejoboxegasu.epizy.com/nupojikolutuzulovod.pdf
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_162b86d6fdcc4ff79ead60d2d89d4078.pdf?index=true
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_f5db1c8182954a1388a8535fd35b438d.pdf?index=true
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_1063fa7c76c049f89fcbbb2e8c254c87.pdf?index=true
    • https://33edd578-4186-4695-89f3-f56a5a23fc53.filesusr.com/ugd/f17c08_3ff18ba782a741f790302b8387ecca65.pdf?index=true
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_21e8dcd6c8a64377a3e3f8fe61d2173b.pdf?index=true
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_e42187d30b514fc59fb30711dd6a0aab.pdf?index=true
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_08f91d2fe5a043ecad9f1a2aefc0863b.pdf?index=true
    • https://40fd9d30-e691-4ad4-9ff9-7de67b304886.filesusr.com/ugd/45b27a_3af399790d294dec83f3e8f71bc94b6e.pdf?index=true
    • http://rowisumemosil.rf.gd/winrar_archiver_for_windows_8.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_off0000f865.bin
f4ba90845f9075d1d54a745c04065ed0381fe6ca154958a87bcc9103689e1ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF865 5288 bytes
font_01_sfnt_off00010a47.bin
8165a56f3ac8d31b4c237b67bf5e00487dc25a10921f0f158f370903317e2993		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 10676 bytes

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