Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fa6f9fecf1e0d0…

MALICIOUS

PDF

77.8 KB Created: 2021-02-20 06:42:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b981295bcf34591b131297a8433443dd SHA-1: 63571245d3e8bf5b6ff6508154d49c4a3eb19128 SHA-256: e0fa6f9fecf1e0d03c98796a2e6eeea842f9e027ac5878492a89367ec87d7230
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to educational topics, likely to trick users into clicking the malicious links.

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=how+to+find+initial+velocity+enzyme+kinetics PDF link annotation
    • https://cdn.sqhk.co/busoleva/gf9lwVY/vida_saludable_aprende_en_casa_segundo_de_secundaria.pdfIn PDF document text
    • http://beramomu.22web.org/vocabulary_for_high_school_students_answer_key.pdfIn PDF document text
    • http://topuxuwuvalam.iblogger.org/bssc_1st_inter_level_exam_answer_key.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe4a1959d270.pdfIn PDF document text
    • http://tactical-jacket-sale.shop/33022259485rctjj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450632/normal_5ff381d6c1d47.pdfIn PDF document text
    • https://cdn.sqhk.co/madeparev/Hggchgi/velitutorofajovozepux.pdfIn PDF document text
    • https://cdn.sqhk.co/gubisagebuto/jdShggg/xajeg.pdfIn PDF document text
    • http://shlifovka-pol.website/fedofetobmuti3.pdfIn PDF document text
    • http://teksalle.xyz/16418318992994nz.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/h6dshco/28676429562.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dekifovep.epizy.com/tezoxumajaxoxaxujoretamov.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/jilor.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/english_classics_books.pdfIn PDF document text
    • http://miduzusajaveg.rf.gd/80774666607.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_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 5400 bytes
SHA-256: fa289ecdd1f0cde768317019597bb9a82bae06857f8b51031f14e8753671398a
font_01_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 10972 bytes
SHA-256: 34971a5c800520654a0dcd2538cc3e771f067d884e42c4ece1c21d8dba0450ca

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