Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a401ab26e35d66…

MALICIOUS

PDF

77.6 KB Created: 2021-03-04 07:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd3654dacd3c4322a35137990db4490a SHA-1: 2d859f201acb0cdaee8cc38191c1d249cc27cec2 SHA-256: 65a401ab26e35d66a1e7d9686a73cec85c25ec53e8caa35a63d7cafe00b1b5b4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with one specifically highlighted as a potential phishing or malware distribution point. Heuristics indicate the PDF acts as a link farm and is flagged by ML classifiers and ClamAV as malicious. The presence of 'curl_of_gradient_of_vector_field3mabd.pdf' in the document text suggests an attempt to disguise malicious commands or exploit references.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=how+to+get+my+brother+wireless+printer+back+online
    • https://cdn-cms.f-static.net/uploads/4374986/normal_6035af90dbb03.pdf
    • https://static.s123-cdn-static.com/uploads/4447912/normal_5fcde17ca1cf8.pdf
    • https://webunufilijamo.weebly.com/uploads/1/3/4/6/134677486/barufa.pdf
    • http://jisetatiloro.scienceontheweb.net/lujon.pdf
    • http://newsportstechnology.ru/technical_report_writing_and_communication_skills2e6ra.pdf
    • https://static.s123-cdn-static.com/uploads/4463263/normal_5fce9345efbbf.pdf
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/tanufadofi-lowizesuzi.pdf
    • http://fortuneo-enligne.com/580454503208t4r4.pdf
    • http://alcexpress3.xyz/curl_of_gradient_of_vector_field3mabd.pdf
    • http://dotavulilego.mypressonline.com/briggs_and_stratton_vanguard_engine_number_location.pdf
    • http://esclub.pro/i_don_t_know_cartoon_faceiegpi.pdf
    • http://itravelgr.com/construye_un_imperio_brian_carruther9s9ai.pdf
    • https://denijebif.weebly.com/uploads/1/3/4/5/134584122/318b3673c.pdf
    • https://cdn-cms.f-static.net/uploads/4447906/normal_603f79ce310d0.pdf
    • https://s3.amazona
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wixanarer/cooking_instructions_for_fully_cooked_spiral_ham.pdf
    • http://nufiwimuzobo.onlinewebshop.net/my_ge_washer_wont_stop_spinning.pdf
    • http://bodegifu.atwebpages.com/demegaforoj.pdf
    • https://s3.amazonaws.com/vavale/agile_testing_istqb_tester_extension_certification.pdf
    • https://s3.amazonaws.com/vapite/10514419645.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_off0000f00d.bin
f4920560cb49d598d3f924f25bc828f9395bdc69f1396d3fdcf6f8e4d4d3471b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00D 5704 bytes
font_01_sfnt_off00010362.bin
554bb76782af32d4b935908192b15463637fad5d36030df99916e0f9dacbff8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 11140 bytes

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