Malicious PDF — malware analysis report

Static analysis result for SHA-256 856f310280660984…

MALICIOUS

PDF

72.5 KB Created: 2021-02-26 10:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6ce42cd057c4dbee5658273dfa3ba29e SHA-1: abbd46e9c190a6a9c3c9369ba18912d81c3e55f3 SHA-256: 856f310280660984d9a94ade350fa0cf4dd0a068d0f01880c84ae664b06cbfaf
126 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated and contains metadata that does not align with typical document content, further indicating malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=spektrum+dx5e+manuale+italiano PDF link annotation
    • http://lusoxokurutugap.22web.org/the_corpse_bride_piano_solo_sheet_music.pdfIn PDF document text
    • http://majubavilusuda.iblogger.org/hansel_and_gretel_abendsegen_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/cKiihb0/u_miami_football_ranking.pdfIn PDF document text
    • https://ruxikikigiligex.weebly.com/uploads/1/3/4/3/134347308/266447.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/dfgi2gj/high_school_boy_virtual_life.pdfIn PDF document text
    • https://cdn.sqhk.co/zotipimesaza/4hgPjdr/hair_salons_near_me_open_now_walk_ins.pdfIn PDF document text
    • https://tulovituvo.weebly.com/uploads/1/3/4/2/134234708/bebir.pdfIn PDF document text
    • https://ramilelajebow.weebly.com/uploads/1/3/4/6/134647205/jekunovewijeli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nevigewiba.epizy.com/free_addition_coloring_worksheets_for_2nd_grade.pdfIn PDF document text
    • http://fotolen.epizy.com/wusavexegikoxibez.pdfIn PDF document text
    • http://xubibufopude.epizy.com/36138571135.pdfIn PDF document text
    • http://bavajozobe.epizy.com/pilufititoxoromevudebola.pdfIn PDF document text
    • http://nokakegobowu.epizy.com/chrome_components_adobe_flash_player.pdfIn PDF document text
    • http://tazefuwavubu.rf.gd/cisco_anyconnect_3._1_windows_8.pdfIn PDF document text
    • http://ropasibemufi.epizy.com/whatsapp_all_apps_apk.pdfIn PDF document text
    • http://kaforezut.epizy.com/how_to_write_a_newspaper_interview.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE0 5168 bytes
SHA-256: 533cbe1db47a475279c86cca365ec69152e267828bd741385bd8b1b8c3401992
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 11896 bytes
SHA-256: 2ed7812d87fb80e203b07cb41ca93261b331392e2c8bd183807a4d290e82cf80
font_02_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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