Malicious PDF — malware analysis report

Static analysis result for SHA-256 331793747d27b6af…

MALICIOUS

PDF

81.9 KB Created: 2021-02-20 05:45:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 33708d541884d15c54abeafe65b08233 SHA-1: 49b234d45886c78b9a4b5326cdcd21ce1d1b2c3f SHA-256: 331793747d27b6af549d90a65cdd4a62dfdc7d2be36b2e9ee2ba1effe3cce8a4
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to astrology and mentions 'wkhtmltopdf', indicating it's likely a lure to a malicious site.

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://jottigo.ru/strik?utm_term=what+does+it+mean+when+your+moon+is+in+capricorn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365657/normal_601392ff40524.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368235/normal_5ff9f2f813c35.pdfIn PDF document text
    • http://fitness-ital.fun/the_roommate_netflix_trailer90q17.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzexesetaba/ihcpji3/21047000750.pdfIn PDF document text
    • https://cdn.sqhk.co/rowubuvuke/RHhbiau/pivaba.pdfIn PDF document text
    • http://xopoxek.iblogger.org/atresia_via_biliar_pediatria.pdfIn PDF document text
    • http://guitar.su/explorer_heyerdahl_crossword_clueibjhs.pdfIn PDF document text
    • http://idealica-columbia.site/pagomunerazm70lm.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/ihgjDgf/death_school_game_characters.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzosexiwugu/YQNighg/temple_run_game_2_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xesozugis/jjlgdGp/shooters_world_powder.pdfIn PDF document text
    • http://alisaborodaenko.design/how_to_ace_the_uber_interview1om32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401519/normal_5fe09d9f1eff9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5fce96182f1c0.pdfIn PDF document text
    • http://gobigs.space/comparative_dissolution_profile_guideline_fdasoz17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vetuvawefaxuta.rf.gd/14832375615.pdfIn PDF document text
    • http://niwuganol.epizy.com/69785480566.pdfIn PDF document text
    • http://dikiboxexoginag.epizy.com/43461727167.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_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 5488 bytes
SHA-256: 71547d95c04c4ec8f1f5dfc65170290d5748c85d05aa43ed7fe996909dd8e316
font_01_sfnt_off0001143d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143D 10616 bytes
SHA-256: eb80a047d42f46f87017f7159d50670a8d41e9efe33cd51d92921d5af91927b2

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