Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f085ea77e3e429f…

MALICIOUS

PDF

67.8 KB Created: 2021-03-18 05:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52ff49eb4a6d877566b64676f970e523 SHA-1: 79df1835d393101a0e0fdb62f7849e79113e958e SHA-256: 9f085ea77e3e429f386b558330232c0d3985d5a173f54236a883c174ff2a4fda
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious sites for further exploitation.

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://xezojetit.ru/123?utm_term=chemthink+molecular+shapes+worksheet+answers
    • http://lightstart.xyz/10_principales_problemas_de_salud_en_mexicok4yix.pdf
    • https://cdn.sqhk.co/negapevu/Hjbrhfv/54703475659.pdf
    • http://yoga-italy.space/722388962i5jmz.pdf
    • http://weinmvc.net/adosphere_2_testy6lvxw.pdf
    • http://alexandreablog.com/listening_skills_in_the_workplace_examples1e6lj.pdf
    • http://legiontry.online/los_7_habitos_de_la_gente_altamente_efectiva_diapositivash2nmo.pdf
    • http://urro-hu.com/864824977115onz2.pdf
    • https://cdn.sqhk.co/vunalogivefu/M4iihfl/77865564793.pdf
    • http://itverys.space/757933255639asvb.pdf
    • http://vojituvidur.iblogger.org/52443035903.pdf
    • http://teasmall.space/43595983536qkbox.pdf
    • http://fashion-deals.xyz/10219801443l91sx.pdf
    • http://shoop-ff.ru/pottermore_patronus_answersd2nar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vifewupanog.epizy.com/87652249528.pdf
    • http://kesugonapopuw.epizy.com/39588752263.pdf
    • http://rupegofiminatef.epizy.com/banujifimabefoxijijevik.pdf
    • http://gotapomoleza.epizy.com/6678014633.pdf
    • http://binawojojin.epizy.com/dhs_diagnostic_assessment_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cba9.bin
5d7de0f4a84c44867847dc4c883ec9a296c5048b42a77aed61d1601d21327add		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 5232 bytes
font_01_sfnt_off0000dd52.bin
aa9d82652c6f682d0bbfbfa69205a1b969ab02c429953768b94a21790d88444d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD52 10768 bytes

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