Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e83c2f1f598773…

MALICIOUS

PDF

74.7 KB Created: 2021-06-11 07:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6ed63ee56cfee3ffc3c657854b18665f SHA-1: 6f0a579738072b324d762a9b324ed17e4a27546b SHA-256: b1e83c2f1f598773974f7f4da004a9565efe61c00778fc8d0d87739a7077a1ee
194 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/pbw?utm_term=movierulz+dhruva+telugu
    • https://kamenibez.weebly.com/uploads/1/3/4/7/134727972/3425931.pdf
    • https://static.s123-cdn-static.com/uploads/4402710/normal_5ff6643edc6c1.pdf
    • https://static.s123-cdn-static-d.com/uploads/4374535/normal_60b1f878f2aae.pdf
    • https://sixamipad.weebly.com/uploads/1/3/4/7/134726782/gasilupilok_gezekuzegedu_tukexolujazob_jibagewaz.pdf
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/jezijininufopij.pdf
    • https://cdn-cms.f-static.net/uploads/4369782/normal_606005af836bc.pdf
    • https://nexolibevi.weebly.com/uploads/1/3/4/4/134463206/49710.pdf
    • https://static.s123-cdn-static.com/uploads/4450504/normal_5fc766635e4cc.pdf
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/5018129.pdf
    • https://fazodokivev.weebly.com/uploads/1/3/4/0/134018208/bixuxazevotel_mutimugare_fotupus_benezowe.pdf
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/zokida.pdf
    • https://static.s123-cdn-static.com/uploads/4368782/normal_5fc816029ab48.pdf
    • https://kilixezexixoz.weebly.com/uploads/1/3/1/1/131163494/6237079.pdf
    • https://zolidejowifaw.weebly.com/uploads/1/3/5/3/135313364/586dabd9.pdf
    • https://xuganozixebiwu.weebly.com/uploads/1/3/4/3/134311953/gufetedowawaj.pdf
    • https://toxoladosa.weebly.com/uploads/1/3/4/4/134479392/154720.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gezebal.pbworks.com/f/how_do_you_clean_the_jack_lalanne_power_juicer.pdf
    • http://mizelabe.pbworks.com/f/23412517773.pdf
    • http://zezimin.pbworks.com/f/compare_classical_and_keynesian_economics.pdf
    • http://fijovolumi.pbworks.com/w/file/fetch/145101324/tidegukomobabaz.pdf
    • http://gutopevif.pbworks.com/w/file/fetch/144880563/stardew_valley_how_to_use_bait_nintendo_switch.pdf
    • http://lijegazoz.pbworks.com/f/dosetoxuvofamiwal.pdf
    • http://kelivesas.pbworks.com/w/file/fetch/145114077/zelozetivapenijosuluneze.pdf
    • http://garigor.pbworks.com/f/jaipur_national_university_date_sheet.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_off0000e670.bin
ef97ce6b8dc226647009cdcb18d2465a9e172c88d34f1f8ba9b0fd1dfa8b8544		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 5024 bytes
font_01_sfnt_off0000f797.bin
03d8c8af4752e72214e223a871e7b88ff839fa6649ebb0670cd88aa432c2191e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 11096 bytes

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