Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfbc9377a3e5ee6…

MALICIOUS

PDF

76.5 KB Created: 2021-03-13 16:17:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30ade1de3294c88812a72b25ed2f036e SHA-1: 6b1112fa9d8db94d43a20dc15300a832c77cf4c2 SHA-256: 3bfbc9377a3e5ee67f56eb613d297a2ebec6b97d6d898f69aecd855c2c602716
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://xajibur.ru/aws?utm_term=divergent+movie+download+in+tamil PDF link annotation
    • https://pejupatuwotim.weebly.com/uploads/1/3/2/8/132814375/593466.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/how_to_find_out_how_many_molecules_are_in_a_compound.pdfIn PDF document text
    • https://sukanogijero.weebly.com/uploads/1/3/4/3/134333185/tobobarefi.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/super_mario_bros_2_walkthrough_3ds.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_6047bdfcf07a2.pdfIn PDF document text
    • http://lebedugipul.mywebcommunity.org/how_to_set_a_timex_ironman.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/83119289840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_601a9c37b2cb9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481411/normal_601856352e082.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/zilar_rebexoraposutaf_ratezo_suvor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368471/normal_600017416ec9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_60290e6ec33aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savifin/87474653166.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/ultrasound_guided_thyroid_biopsy_technique.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/gokomonokur.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/cotting_school_annual_report.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_off0000eda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 5120 bytes
SHA-256: 80afa60e510ebee1f0734740ea60711e3d3769df6642caf665879159b669e8cc
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 11212 bytes
SHA-256: d60b484377cc64b01ff3759e3502f86f9167f4386d81a2341ac94ca5e124deab

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