Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5af6d49b3cab7c…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 10:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5ec6ee3dfefb9035d82094bb1d3bcc7c SHA-1: b26987a6cb54a6a158d9368314b673d5ef176049 SHA-256: cb5af6d49b3cab7cb9ed6175f4bc7deeb6b70e479a6e5ee2d95f10d07fa99297
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/award?keyword=bionic+turtle+frm+practice+questions+pdf PDF link annotation
    • http://sowopezamiw.medianewsonline.com/how_to_use_blender_for_roblox_gfx.pdfIn PDF document text
    • https://cdn.sqhk.co/fuguwaso/kZjiL97/litumigufex.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/p0Rgeji/sexuzafeza.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/jgNjiWd/96897943431.pdfIn PDF document text
    • http://jojidasusesot.sportsontheweb.net/xesepesafuxuvulosafog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_603cccb046703.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/jejcDie/tobogodufuxuwa.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/let_us_cling_together_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/ggTgIjd/pre_eclampsia_nice_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/fojufifef/0Hhiigi/certified_internal_auditor_syllabus.pdfIn PDF document text
    • http://bowodimi.iblogger.org/lurofurawalaxadu.pdfIn PDF document text
    • https://cdn.sqhk.co/vowibesep/idifial/define_underhanded_person.pdfIn PDF document text
    • http://xagidodovinudu.iblogger.org/88096880579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_5fdb024bcfaac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gizexagivet.rf.gd/ergonomic_workstation_setup.pdfIn PDF document text
    • http://jixumuvaba.epizy.com/dapiwevok.pdfIn PDF document text
    • http://foduwisidowej.rf.gd/11440728894.pdfIn PDF document text
    • http://fogidifi.epizy.com/tunatedadukenidalotezane.pdfIn PDF document text
    • http://pesorujegajev.rf.gd/bartender_training_manual.pdfIn PDF document text
    • http://gezofavuxova.epizy.com/biology_major_resume_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE430 5476 bytes
SHA-256: 91583f251b5559d8d812eb63d83ce336143d59de67b40ea7effbbdd57c634be3
font_01_sfnt_off0000f6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B5 10976 bytes
SHA-256: b9130d519cf1686b4f7bb280724188f0ac65caae39dd81772f94722c67421d6f
font_02_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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