Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed5e870d32cd5b9…

MALICIOUS

PDF

76.5 KB Created: 2021-02-28 18:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4ef5cacd0e2e119ea674f930776ce189 SHA-1: 7e6a574f7d162b1302565a5c0168a0c4b6f088ae SHA-256: 9ed5e870d32cd5b98483656b29f15bfc85c7b0df68b7e804b8485a7160df8d1d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains or potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and heuristics point towards a link farm designed to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/strik?utm_term=rock+climber+workout+program PDF link annotation
    • https://cdn.sqhk.co/letonolomo/hgiehhj/prodigy_math_game_toys_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/WqUHPjh/galaxy_sky_shooting_unlimited_game_download.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/what_are_intellectuals.pdfIn PDF document text
    • https://cdn.sqhk.co/sativomofij/dghjg5n/dreamers_and_schemers_neck_gaiter.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/how_much_is_a_pole_vault_pole.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/aac961d1.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/my_family_and_other_animals_1987_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/difixoruze/x12Iij4/cloudy_with_achance_of_meatballs_book.pdfIn PDF document text
    • https://cdn.sqhk.co/sowodopevew/bhbghjf/dungeon_quest_cosmetics.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/ghbgcYN/mirrors_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/ljdggEt/redopisamebaluxededib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/bovipapuwavazarofadagan.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/4042443881.pdfIn PDF document text
    • http://nanakoje.epizy.com/34250340674.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/vexujefoj.pdfIn PDF document text
    • http://lofadezowudekeg.epizy.com/feguzorukimifigusixatitu.pdfIn PDF document text
    • http://jivatufuwofed.rf.gd/totirusisotobuki.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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 5380 bytes
SHA-256: 72ad27ee803c5a76e8310b354048cfd456e5dcd9132ef11f9b445b527340bb91
font_01_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 1796 bytes
SHA-256: c9c850e9c351ce199d5e9d1c42a783cd39d33267a74ccb43d8a2fed304f07254
font_02_sfnt_off0001002e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002E 10700 bytes
SHA-256: 8438140b9cbdbbfcb62bbe77e6828d75e8fb646d5415f87a3187bf9e2ba845ab

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