Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce61f38da4cff899…

MALICIOUS

PDF

118.4 KB Created: 2021-03-23 02:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 57456dcc90da72e2a0dd1e9b7811faa5 SHA-1: b3e1d9d7f6e24beb012b2bafc1e66b19ec26fb41 SHA-256: ce61f38da4cff899054c1c802f43f87f687443b2a5f1c939dfd5314648190caa
126 Risk Score

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://zajinet.ru/award?keyword=cardiopatias+congenitas+pediatria+pdf PDF link annotation
    • http://simkosa.website/16366110809skvt3.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/edgar_allan_poe_storiesxlcti.pdfIn PDF document text
    • http://e-devletodeme.net/how_to_use_a_presto_pressure_cooker_canner0a2e9.pdfIn PDF document text
    • http://xinupavob.iblogger.org/22003000001.pdfIn PDF document text
    • http://korecos.ru/how_long_did_it_take_you_to_study_for_real_estate_examrbgzm.pdfIn PDF document text
    • http://whysmall.space/67920651409udw5q.pdfIn PDF document text
    • http://ens-pictures.ru/kekiwumawatg338q.pdfIn PDF document text
    • http://idealslimitaly.site/gerineralujuxagixewatohuwk0.pdfIn PDF document text
    • http://maslovauto.ru/76353819840ruir3.pdfIn PDF document text
    • http://onlinekartiadesi.com/722246400880skwq.pdfIn PDF document text
    • http://pomirkapa.site/zakivugevuzusulfe96z.pdfIn PDF document text
    • http://esclick.pro/example_of_integrative_reviewuq25x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://selewexa.rf.gd/rerujadapamunogop.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_4739a44252514049911790aa4a8f067d.pdf?index=trueIn PDF document text
    • http://pubitawiwinas.rf.gd/58454131505.pdfIn PDF document text
    • https://f39f7cea-6337-46de-af4f-699959e6db0a.filesusr.com/ugd/004672_69448ada03d54bb195f42698e39a79dc.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_787b6cdbb1434b6da9e8fe80deda60ea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/online_marketing_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/paris_metro_map_iphone.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_off0001905f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1905F 5196 bytes
SHA-256: c40fb3ed4d432c81b370f21f702b1a0ce898759510e8d9f59450d2c622ed553d
font_01_sfnt_off0001a218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A218 13028 bytes
SHA-256: 3fdd91ffefeba9cbe74d7a379fdcead8814056eb22e6534f6f85c47699f7533a