Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26ee20ff605f08b…

MALICIOUS

PDF

70.7 KB Created: 2021-02-21 13:56:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c17efb94ebd5d0a8c44b8ec5b3cf3d9a SHA-1: ba7afcce5727ff9ba0892e38dd56792a69edbabb SHA-256: c26ee20ff605f08b720fc5b722e60be4920940672c48d39c1dd9ca752ecbcdba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using multiple disposable domains to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=english+grammar+book+elementary PDF link annotation
    • http://raftgjgr.space/zotero_annotationjsfsb.pdfIn PDF document text
    • http://loberas.22web.org/78371494052.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/dfpjgu0/globe_load_wallet_retailer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407788/normal_5fe0fd9260ed7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390373/normal_60023610705ef.pdfIn PDF document text
    • http://wosurijegu.22web.org/autogenous_shrinkage.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/baposivarabuj/18245914698.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/xipubame.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/logomesagesofepevoxis.pdfIn PDF document text
    • http://fepesori.rf.gd/2018_answer_key_uptet.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/cdo_full_form_in_indian_railway.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/dogusetixojomibigekur.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/lekafadoviwezuw.pdfIn PDF document text
    • http://wadokeg.epizy.com/65854337746.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_off0000d984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD984 5364 bytes
SHA-256: 778317d1310b143891809fa29a392521b7fdf9db3608cdf2037ca0f416493e21
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10172 bytes
SHA-256: dfdcdf5044ddf58140f188392214c82429cade7b91ce7413a86dff0e1a92de96

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