Malicious PDF — malware analysis report

Static analysis result for SHA-256 2982ac9d67941327…

MALICIOUS

PDF

77.2 KB Created: 2021-05-11 06:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c457f6133c3b0462e0d77e196bf70a13 SHA-1: 501e0a241475dd1700012e1f3b5fe1fbd1826cb9 SHA-256: 2982ac9d67941327b9f5e3469875d9aed7cbe1ad6742cf157002d020d54cc0b0
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, suggests a lure related to 'problem solution text structure anchor chart', which is likely a pretext to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/strik?utm_term=problem+solution+text+structure+anchor+chart
    • https://cdn.sqhk.co/xiladuxe/HheQn77/11432262424.pdf
    • https://cdn.sqhk.co/pupevadojas/emZifhg/riesgo_relativo_interpretacion.pdf
    • http://duzegotola.medianewsonline.com/assam_police_result_2020_download.pdf
    • http://fuwijumazawad.mywebcommunity.org/17401048385.pdf
    • http://sidufapas.mywebcommunity.org/what_are_the_major_parts_of_natural_selection.pdf
    • https://cdn-cms.f-static.net/uploads/4383340/normal_601886e518e39.pdf
    • http://zutatowatipo.mywebcommunity.org/what_bible_says_about_adultery_and_fornication.pdf
    • https://cdn-cms.f-static.net/uploads/4460447/normal_60540fcfbc6fe.pdf
    • http://fizebiredasibi.mypressonline.com/adp_run_payroll_employer_login.pdf
    • http://jafinipu.scienceontheweb.net/namaboxapaburovu.pdf
    • http://tifusavegapawuf.mygamesonline.org/zezelijiki.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_606c82c2362c1.pdf
    • http://majusenise.sportsontheweb.net/tim_noakes_banting_diet.pdf
    • http://worameruvejaka.mywebcommunity.org/ranezidov.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_6014111684b4e.pdf
    • http://jelojutu.sportsontheweb.net/zenewuzagadokexobarane.pdf
    • https://cdn-cms.f-static.net/uploads/4388181/normal_602e0937682d3.pdf
    • http://dexaputanit.mygamesonline.org/craftsman_chainsaw_16_s56_chain.pdf
    • http://vumejopiraxu.mywebcommunity.org/apexogenesis_vs_apexification.pdf
    • http://wofefudolojet.mywebcommunity.org/capacitores_electroliticos.pdf
    • http://safijejog.mygamesonline.org/kilakab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://luvetux.myartsonline.com/biblia_cristiana_completa.pdf
    • http://jemukiguwuw.myartsonline.com/alimentacion_complementaria_catalua.pdf
    • http://firiwigisu.atwebpages.com/78504253471.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_off0000ef5f.bin
68f1957d9fd4eccd3f5c4cbd24b807a738b7724fe51e3c864c07f429803ccb08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 5248 bytes
font_01_sfnt_off0001010b.bin
5d73be1cf10b0aedf6c063a404e13632b2c35c470dae1e4ef999c41c32b7ca71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 10748 bytes

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