Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c829ffc483efbae…

MALICIOUS

PDF

72.5 KB Created: 2021-02-28 00:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2f86025c5ca299a61a0ab030dab44972 SHA-1: 4efcd52e24fdf84cf94a8375fab6b51a5910f588 SHA-256: 6c829ffc483efbaefc43aa9375892f5c0bd336632ff6a7a7b9396c00018401fb
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 presence of a URL with a 'covid rules' query parameter indicates a lure to attract victims. ClamAV and ML heuristics confirm the malicious nature of the PDF, classifying it as phishing or a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=what+is+the+current+covid+rules PDF link annotation
    • https://cdn.sqhk.co/xumirikebixo/8ibHxkE/gefagogavudowigul.pdfIn PDF document text
    • https://dejaxunex.weebly.com/uploads/1/3/4/3/134318563/zidalaxen.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/jigiWyK/free_pinball_game_no_download.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/koluzepajaga-malexefig.pdfIn PDF document text
    • https://cdn.sqhk.co/lukuvekeliki/hjnRBs5/96105593537.pdfIn PDF document text
    • https://cdn.sqhk.co/nimabugokofa/iVWjbhi/66674035245.pdfIn PDF document text
    • https://mebijanuwirat.weebly.com/uploads/1/3/4/0/134042853/pizukitibisidewavan.pdfIn PDF document text
    • https://cdn.sqhk.co/mojafefegamo/jea9M3z/cosmoprof_asia_login.pdfIn PDF document text
    • https://cdn.sqhk.co/vinikawikuve/ujdLhh2/farofumabazaxijije.pdfIn PDF document text
    • https://cdn.sqhk.co/musarawaw/4ZKheEU/pottery_simulator_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nixuvaxuw/jgTHihf/pixelmon_mod_for_minecraft_pe_apk.pdfIn PDF document text
    • http://pipawopozovifo.iblogger.org/57692756640.pdfIn PDF document text
    • http://kujakaveru.iblogger.org/zodadewenim.pdfIn PDF document text
    • https://cdn.sqhk.co/wavudasawete/ehhggmy/wepifariretuzewugenamena.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/iaoijSg/53819159445.pdfIn PDF document text
    • https://cdn.sqhk.co/karapenakozi/j4hbjeO/bazifeji.pdfIn PDF document text
    • https://cdn.sqhk.co/tolebilu/gRgdUds/mubabofivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nupopejif.epizy.com/envato_market_web_templates.pdfIn PDF document text
    • http://mowesedapi.epizy.com/minimally_invasive_radioguided_parathyroid_surgery_uk.pdfIn PDF document text
    • http://xumerapugegivo.epizy.com/96808724563.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC2 5100 bytes
SHA-256: 049778e89445f37627adf8a611a606849054552d1f2f921a76408d04984b434c
font_01_sfnt_off0000f126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 10540 bytes
SHA-256: e69fe52366461293cd728448e7e2e7e9ea10c6f440b103e18a65e5bb2d85aff2

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