Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3bfd5a86ab0cc7…

MALICIOUS

PDF

84.6 KB Created: 2021-04-11 06:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9329635190ddd359754b406daea9e210 SHA-1: 576cf9eab414fc7f5d3f27db9da721cc6f85cb02 SHA-256: cb3bfd5a86ab0cc73ac83ba719747350ef2ee2bc2ac765c386447d894be56860
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-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://leonvi.ru/strik?utm_term=why+is+my+dishwasher+leaking+from+bottom+of+door PDF link annotation
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/sojolefizofimojok.pdfIn PDF document text
    • http://xurekurise.iblogger.org/rapugulurudidutenalapa.pdfIn PDF document text
    • https://zasevolonuto.weebly.com/uploads/1/3/5/3/135335071/b924489.pdfIn PDF document text
    • http://wimesuzajomos.mypressonline.com/zudamitonogul.pdfIn PDF document text
    • http://witikotuxigere.scienceontheweb.net/dr_joe_dispenza_breaking_the_habit_of_being_yourself.pdfIn PDF document text
    • http://delabozaxexiris.getenjoyment.net/demande_d_attestation_de_salaire_cnss.pdfIn PDF document text
    • http://jivizebunov.22web.org/glacier_bay_kitchen_faucet_mounting_hardware.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/93297154671.pdfIn PDF document text
    • https://cdn.sqhk.co/fezivabuja/Mjaf6gd/fitbit_versa_2_bands_rose_gold.pdfIn PDF document text
    • https://webakutukulufu.weebly.com/uploads/1/3/2/6/132683024/0e3899ccdc7c4f.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/jb99Fx9/387161386.pdfIn PDF document text
    • https://rotarivinevi.weebly.com/uploads/1/3/4/5/134599250/xezibasut_lemojolodusa.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/6zIjchb/67420822245.pdfIn PDF document text
    • http://xukosususif.medianewsonline.com/nsk_pillow_block_bearing_catalogue.pdfIn PDF document text
    • https://cdn.sqhk.co/pesuxitum/6jiibgo/34___2019__youtube.pdfIn PDF document text
    • http://ginalupajeriw.scienceontheweb.net/90024219631.pdfIn PDF document text
    • http://nufapivevavenak.22web.org/93541789734.pdfIn PDF document text
    • http://wuromigujab.iblogger.org/understanding_reliability_and_validity_in_qualitative_research.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88c16b7-c8c7-4100-9227-aee7a52d1836/what_do_plants_animals_and_humans_need_to_survive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51f9fc33-c784-42bd-8df4-9a8a21011a2f/44496157887.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_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 5732 bytes
SHA-256: c3426ed0580fff3429278c30a565b0f25c4501e622e64d72d7e56a6d4ecb6ecb
font_01_sfnt_off00012142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12142 10400 bytes
SHA-256: 1a336b476d692f7f891c7dae66fb364b3166635de13e83c6373189bdc72115b8

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