Malicious PDF — malware analysis report

Static analysis result for SHA-256 1366d3a0a5115262…

MALICIOUS

PDF

74.6 KB Created: 2021-04-30 04:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe24850c9c7bac277492ac15118794c7 SHA-1: 794d569c7b782829baec0943388814b3c6e9bc02 SHA-256: 1366d3a0a5115262b1bd7cb8d1a813894f992c5ee43c9985097fa6e75447e31c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards exploitation for client execution, potentially via a malicious link or embedded exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=lowrance+hds+5+tutorial
    • http://lowwsaw.xyz/melegabunudalutulafufp7b4h.pdf
    • http://labetimo.iblogger.org/zasixefeme.pdf
    • http://gajaxujifusokul.mygamesonline.org/bouwbesluit_2020_download.pdf
    • http://ubzvp.com/4470680447g316g.pdf
    • http://meetcabinets.xyz/649267696741b46b.pdf
    • http://difanitukovu.mywebcommunity.org/27024236999.pdf
    • http://tolujupa.22web.org/51650238253.pdf
    • http://4escam-bot.online/minority_report_ending_realpggko.pdf
    • http://circulshtangcalip.website/62212679048oehlk.pdf
    • http://mnogolidov.xyz/68981786845xsiuf.pdf
    • http://nosaraxes.22web.org/ssc_stenographer_2018_application_form.pdf
    • http://evilcheats.fun/90976852956c9w10.pdf
    • http://voirly.xyz/707269166965fw3v.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/navoburarovada/34373471502.pdf
    • https://s3.amazonaws.com/senodiw/mp4_music_videos_free_online.pdf
    • https://s3.amazonaws.com/lorifumofelu/golulova.pdf
    • https://s3.amazonaws.com/lizuseguwix/54217627552.pdf
    • https://s3.amazonaws.com/solonebosop/19040702008.pdf
    • http://zajegugolex.epizy.com/cheap_sheets_for_queen_bed.pdf
    • http://botovomevagexe.epizy.com/imslp._org_free_sheet_music.pdf
    • http://wegugoleta.onlinewebshop.net/harry_potter_characters_and_their_hogwarts_houses.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_off0000e69d.bin
546c353eebb0c6aa4bc7889c4a19def41cf839053199774cd7868820044b0dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 5184 bytes
font_01_sfnt_off0000f851.bin
c7b6ca8278cb23eda8a5a327e0157ac1a39a648b69ecb1ce5bea004c9ba1fcf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF851 11052 bytes

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