Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec49295b73e2290d…

MALICIOUS

PDF

83.2 KB Created: 2021-02-16 09:11:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 584802d1b81030f35694847fd5d52b48 SHA-1: 693eae5e4034ed6b55c79d91e42bd8f487ad7ea7 SHA-256: ec49295b73e2290d4289b79447ae15d0fc0cb8829b211877240bd20a9ce1e14f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one prominent URL that appears to be a lure for further malicious activity. The document body, though heavily obfuscated, suggests a deceptive pretext related to HTML tags.

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://jacksth.ru/strik?utm_term=html+tags+list+with+examples+and+description PDF link annotation
    • http://unosital.space/35821555362rmbwh.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/hchahjr/mario_maker_2_level_ideas_generator.pdfIn PDF document text
    • http://hookup753.fun/nonigolonofowujotelay3can.pdfIn PDF document text
    • http://spiritstudio.ru/24332736446z0tbh.pdfIn PDF document text
    • http://gratoramaa.website/afternoon_with_irish_cows_literary_devicesry3te.pdfIn PDF document text
    • http://carinsusa.com/nier_automata_pc_performancejsr2w.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/jhoicoH/gogifolidifulexo.pdfIn PDF document text
    • http://smcjd.com/67324870663i2q08.pdfIn PDF document text
    • https://cdn.sqhk.co/javomekoru/bjg7o5U/vigopiwejoguvuboxibige.pdfIn PDF document text
    • http://repair-planshetov.ru/72158910781oacib.pdfIn PDF document text
    • https://cdn.sqhk.co/sifapudoxig/CGjdijI/89585911219.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/super_bikes_riding_challenge_pc_downloadgz6cp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zabukek.rf.gd/ferikimorizexunoxanomiwak.pdfIn PDF document text
    • http://vovokab.rf.gd/pefazigamewapebudezibapi.pdfIn PDF document text
    • http://simumomoluj.rf.gd/e-9_explorer_ffg.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_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 5608 bytes
SHA-256: 1b93039bc8bf8e5996dd077f428bd08007e346dc702ff38f4beaf518b27734e7
font_01_sfnt_off00011016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11016 14940 bytes
SHA-256: 065062db83474b028dce41a8d0bcdafd3ee128b1918e3e75b511c82e1e28c028

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