Malicious PDF — malware analysis report

Static analysis result for SHA-256 36e29f44905e9de7…

MALICIOUS

PDF

76.4 KB Created: 2021-04-13 17:40:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5e12ccd3cb697d68d26005bd0c75c2c1 SHA-1: 5ebaa93613f31d4704d8edcfb0d9df575c9564f3 SHA-256: 36e29f44905e9de7e1308699768ce1da4e96fad1b430ec1bb4de082385e46a34
186 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. 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 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.
  • 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://midufefew.ru/strik?utm_term=c+call+by+reference+vs+call+by+pointer PDF link annotation
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/4715361.pdfIn PDF document text
    • https://ludebopukum.weebly.com/uploads/1/3/1/3/131380916/magozazuxinajuzete.pdfIn PDF document text
    • http://jugepawe.medianewsonline.com/3rd_grade_math_multiplication.pdfIn PDF document text
    • http://febiterozoz.medianewsonline.com/ham_radio_band_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446490/normal_5ff2d65bd59a3.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/2197168.pdfIn PDF document text
    • http://fuwijumazawad.mywebcommunity.org/79633010587.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481059/normal_5fc9925013d05.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/jedaxopopuko/sears_kenmore_dryer_repair_manual.pdfIn PDF document text
    • http://wivaxodi.onlinewebshop.net/26509515462.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_86d1bf871eda4f329a610f4323db3f18.pdf?index=trueIn PDF document text
    • http://sujetolus.epizy.com/selected_astm_standards_for_structural_steel_fabrication_2020.pdfIn PDF document text
    • https://f62823ea-e863-4eb7-bd7c-e3bac0139ff1.filesusr.com/ugd/8c639a_d67bc91ef7a842c1b5c7c9f660e47b55.pdf?index=trueIn PDF document text
    • http://wijuromosumeko.rf.gd/dell_poweredge_r730_drivers.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/additional_mathematics_form_4_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/bugutaj/midiril.pdfIn PDF document text
    • http://fafebexa.epizy.com/10952790646.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_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 5216 bytes
SHA-256: 01788cb9dd877646aac4a027164b59aac9dcd6478b911e4f1d682a0214b79b8f
font_01_sfnt_off0000fe3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3D 11300 bytes
SHA-256: 23c26a4acde860e6717f33b5d89438c40b8b50fd3d9984be42c49fed4d180c73

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