Malicious PDF — malware analysis report

Static analysis result for SHA-256 822fd6b8e19769f6…

MALICIOUS

PDF

82.4 KB Created: 2021-05-04 12:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: cc2533d0018bca1f6f0ba2e698fcbde3 SHA-1: b5d9e764fb3eb7b1985b6da845c26e3ed79d4e0a SHA-256: 822fd6b8e19769f64eba07fe92f782c010a0d637380cb2a696c0634b280b8916
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. The document body's deceptive title about Amazon and COVID-19 testing serves as a lure to encourage clicks on these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=does+amazon+test+employees+for+covid PDF link annotation
    • https://cdn.sqhk.co/nepajenine/fCDAjaD/nogavanobuw.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/hWgijcN/kazarma_hotel_booking.pdfIn PDF document text
    • http://pixxel.life/wetimusunotavuvuzabuz1q22.pdfIn PDF document text
    • http://mestorating.ru/casio_fx-_85gt_plus_calculator_manualbk9vc.pdfIn PDF document text
    • http://jaxebememapi.iblogger.org/37144414514.pdfIn PDF document text
    • http://interbank.link/99333956111fpcyw.pdfIn PDF document text
    • https://sekepavikaforo.weebly.com/uploads/1/3/4/6/134608196/5ab4a23bf46a6eb.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/ih4sjd9/buwamorolavudarutem.pdfIn PDF document text
    • https://cdn.sqhk.co/gabazumad/Fnqhh4A/calendar_2020_september_holidays.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/gfidlmM/53403819955.pdfIn PDF document text
    • https://cdn.sqhk.co/puzadowoke/heqhdgi/react_drag_and_drop_npm_install.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/mabezuje-mumipi-naduvupu-fakuvojapiwete.pdfIn PDF document text
    • http://levantegroup.net/85408667927l8duj.pdfIn PDF document text
    • https://zugatuwedi.weebly.com/uploads/1/3/0/8/130874050/wipaxowete.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/jjjhahj/marvel_s_runaways_season_2_episode_7.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/ha1mOgf/defuse_the_math_bomb_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/aifDhas/swing_chair_cushions_ireland.pdfIn PDF document text
    • https://cdn.sqhk.co/raxuzuvuluf/bgigNgg/36776655545.pdfIn PDF document text
    • http://presentinsta.site/delaxetosetamokibazuvarup7vjd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tedaxoj.epizy.com/head_first_java_2nd_edition_epub.pdfIn PDF document text
    • http://memokikadu.rf.gd/legixopulobed.pdfIn PDF document text
    • http://mafolizol.rf.gd/pringles_mystery_flavor_answer_2018.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 5512 bytes
SHA-256: 96546e70befc7cf3ec9ec8cfc04974404c5d6c6cd987d034df188096fbc7f706
font_01_sfnt_off0000fcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB1 11132 bytes
SHA-256: 8b5b4c422465bce8501b94e7fcf0af4ea825a3e47f5a3e901e357f3536c715d9
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 16656 bytes
SHA-256: 3d8ea6f7e9dbbd4c0598866858a164af44686d5ed0fe292ed0c60857af399c53