Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ec4eb0388770f60…

MALICIOUS

PDF

109.1 KB Created: 2021-03-08 07:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 950ea1cd2f6508835b3b6b55e7e87a51 SHA-1: e41f7ddc71f7727390b210dedfb952ef628dc57b SHA-256: 5ec4eb0388770f60be0e341449e09feaabeb00b7a29b58ccaa0dae4aa88dd9f9
134 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous external URIs, with one prominent URL being `https://pelibifir.ru/strik?utm_term=what+is+r+statistical+language`, suggesting a lure related to search queries. The document body, though heavily obfuscated, contains text fragments that hint at urgency, further supporting a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/strik?utm_term=what+is+r+statistical+language PDF link annotation
    • https://cdn.sqhk.co/webepinovet/7Upjbge/starfall_math_journey_back_to_school.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_6039a47ecb296.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445320/normal_5ff3ebba6608e.pdfIn PDF document text
    • http://segaruzobuguses.scienceontheweb.net/wibujunake.pdfIn PDF document text
    • http://mumolazesinidix.getenjoyment.net/how_to_get_a_private_investigator_license_in_georgia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_601481b719c88.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/jVpPgdY/24498899460.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496818/normal_5ffa785a7b430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408984/normal_5fdade8fd281a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496853/normal_6027af6bd67a2.pdfIn PDF document text
    • http://usesol.xyz/nazm_hikmet_gzel_iirleri_ksapvqr2.pdfIn PDF document text
    • http://investorlands.ru/prophet_sport_mini_lipo_charger6s1yx.pdfIn PDF document text
    • http://kiparegazeratax.getenjoyment.net/my_husbands_secret_wife_lifetime_movie_2018_cast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_60223c24b5d30.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://rususekobijo.myartsonline.com/subuto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dff0e68e-5c97-4b7a-8ca6-6b4e0d1ec7c7/ejercicios_de_moda_estadistica_para_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5c9b046-f957-4ba5-aec6-da4d21d96473/momatolulu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7D 4844 bytes
SHA-256: 9429ad5ebbd3456bca744910f5df6dac218822909f0a83e36d3e9161c1327a42
font_01_sfnt_off00016ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF0 12728 bytes
SHA-256: 51e9c69bdb7689e1f7f96479d9e5498c0aec740a8180f1c3646c2987e706ec55
font_02_sfnt_off0001989a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1989A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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