Malicious PDF — malware analysis report

Static analysis result for SHA-256 10f0ea0a2674ebbf…

MALICIOUS

PDF

74.1 KB Created: 2021-03-14 01:53:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51e112f03972846f70877c5276356f45 SHA-1: c76d74a1d8e76f2f307e4ec9abeac57f8de96ffd SHA-256: 10f0ea0a2674ebbf576257f210ba1a9de2da2c6f7930e5b202b7dc5c16ca2242
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'zajinet.ru' which appears to be a lure for users searching for specific PDF content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or spamming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=binomio+de+newton+ejercicios+pdf PDF link annotation
    • https://talebizipuvi.weebly.com/uploads/1/3/1/4/131483067/wexadodiramisolelar.pdfIn PDF document text
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/4d6a85c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_601b2d876660a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490736/normal_5ffae49c01829.pdfIn PDF document text
    • https://rusuligoxajikug.weebly.com/uploads/1/3/4/3/134399392/nidifunij_wedubomijap.pdfIn PDF document text
    • http://dotavulilego.mypressonline.com/xazik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fc9ff71c9727.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/cost_accounting_calculation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444877/normal_5fc7e3ad6c43a.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/41062705207.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5ffe425edc8c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_6030fb7f9fb59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_6023cb4a2ad93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5ffd237b7d122.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fidegaf.atwebpages.com/palomudowu.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/chudi_jo_khanke_new_version_ringtone.pdfIn PDF document text
    • http://zubiluwetij.myartsonline.com/first_90_days_in_leadership_role.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/kekepogatozidekexo.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/bemavixigisonomewifure.pdfIn PDF document text
    • http://jozobudesurarab.onlinewebshop.net/99140154752.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/ingersoll_rand_t30_2475_parts_manual.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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 5276 bytes
SHA-256: 5620096fdb6ee772acdab8f0622b891bce1828b05d9c28cff9884a0e7c9000a9
font_01_sfnt_off0000f223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF223 12164 bytes
SHA-256: ea1c7808defc1632c020c659efa0cecc1cb05c90d51ea553d0bb79ff66d8329e

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