Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1f7e8bb342e90b6…

MALICIOUS

PDF

95.2 KB Created: 2021-04-15 08:09:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: be52b409fda84b3cb36497bb9681c434 SHA-1: 78462b8847198cb18155119f04d225772d1c313d SHA-256: f1f7e8bb342e90b6f2715251dd80ff05cfca9d90eef94e5d0bf6c560cf5aa19d
126 Risk Score

Malware Insights

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

The PDF document, disguised as information on nursing decision-making models, contains numerous embedded URLs pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/strik?utm_term=types+of+decision+making+models+in+nursing PDF link annotation
    • https://cdn.sqhk.co/kufiremikaf/9jdhb8v/green_bay_packers_game_highlights.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/QhjgdlU/gifofuzegusujasuma.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/30120640668.pdfIn PDF document text
    • http://swiss-gear.shop/bexonizijenululazueh36o.pdfIn PDF document text
    • https://cdn.sqhk.co/vifaduvej/jrihgdq/67340227935.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/voguritosizogetoxalivogid.pdfIn PDF document text
    • http://peuer.xyz/xiwonufulurawesy8o7.pdfIn PDF document text
    • http://indir-kazan.com/sogajunulevafesedanesajilgbpu.pdfIn PDF document text
    • http://bitcoins-profits.com/storyline_3_game_templateslz7og.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/what_micro_sd_card_for_samsung_tablet.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/fPgiaeT/wisamomori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wurebosuloxu.myartsonline.com/zabaxoxelowugojuju.pdfIn PDF document text
    • https://891dfe3a-8969-4df2-b253-5ccc4ebbb7a0.filesusr.com/ugd/e66789_153e6133511544228f1bb3ad23274503.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/dawow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9e32bd-e190-4b14-a0df-17897cfc531f/75823035786.pdfIn PDF document text
    • https://ba428ff1-d53d-4eb5-bdb2-cc960067f420.filesusr.com/ugd/7041e4_cd8950d00466497192adcf109e570f79.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tezude/java_spring_framework_documentation.pdfIn PDF document text
    • http://lerumedinopox.onlinewebshop.net/capacitor_formulas.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/malibu_outdoor_lighting_system.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/91165111825.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3b1a00-50c7-4dad-acb5-70993e364248/50636507511.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9573016-e2cc-4a5f-aed5-dbc8e8a622b4/suwukinon.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/fnac_test_report_time.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_114cb147c2e945fd904648013abc2579.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001382b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382B 5592 bytes
SHA-256: 4ca2ed83b61aed58e2d4993641876ed036598378524911fe1ee1f0b4a804d7f1
font_01_sfnt_off00014b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B29 10632 bytes
SHA-256: b5a2ce30695e616a7bb0dda571ccfefcb915cd1c56e11857d47091b73337e4c5

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