Malicious PDF — malware analysis report

Static analysis result for SHA-256 655a909cacd6135c…

MALICIOUS

PDF

84.8 KB Created: 2021-04-03 22:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 596cc191efe5086b186e3680c00fa579 SHA-1: b1bd83c785913e95beee69ce73c671f80ffb1b6e SHA-256: 655a909cacd6135c3d3a2411a706ca1ba581957c3bbcc1a7c170bed16901d7e2
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 0.9996

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=street+law+textbook+9th+edition+pdf PDF link annotation
    • http://fuwijumazawad.mywebcommunity.org/80488421619.pdfIn PDF document text
    • http://prodson.fun/96861580653tmnzn.pdfIn PDF document text
    • http://tricitysikhs.com/tosifomsc2v.pdfIn PDF document text
    • http://djami.ru/fujitsu_halcyon_dc_inverter_thermostat_manualonwj0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_605f6ea649ddd.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/ladivivola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496605/normal_602adcdc8ba46.pdfIn PDF document text
    • http://prosale.company/joss_whedon_wonder_woman_draftid006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_605961d5ba7d4.pdfIn PDF document text
    • http://disconto50.info/sixisojuxixixizujifam05teo.pdfIn PDF document text
    • http://radogomi.mygamesonline.org/norcold_refrigerator_support.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/ajRjdgi/nubiporalewaxexuxum.pdfIn PDF document text
    • http://hellesypakk.online/what_are_the_components_in_a_turbine_engine_fuel_systemb0118.pdfIn PDF document text
    • http://futajef.medianewsonline.com/pibomena.pdfIn PDF document text
    • http://winfreeiphone.xyz/junie_b_jones_books8o3xd.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/YjipaOQ/pariwadujixanoteg.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/zDyegc7/69460644794.pdfIn PDF document text
    • http://lebofawudire.mygamesonline.org/rosuwuferetopime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449777/normal_6026bfeed76ba.pdfIn PDF document text
    • http://detonic-ufficiale.website/35834908641umw8j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zogadawedalifap.onlinewebshop.net/sadokasigetenunit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 2900 bytes
SHA-256: 40ce0bc9b113ef031639604f059b60aa9f1e41b097d60e75bfbf620cccc66306
font_01_sfnt_off00010bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF3 5576 bytes
SHA-256: 99157ba9a154fdb38323a5c0a24df6f97a897354d2521a209538f90309b7ab83
font_02_sfnt_off00011ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 11216 bytes
SHA-256: 003d5e8a8d90bebebd47381158f1d425da52974abc449e7d6fff80279119a512

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