Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13a035ebdea4156…

MALICIOUS

PDF

89.2 KB Created: 2021-02-28 02:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6e7f270590a7cd8bb19161ae00a87b13 SHA-1: 18b9886630a473132eb127d2273bda97e505c4aa SHA-256: f13a035ebdea4156e2175696c8e60921e007515f791d14e191990120d39a6f32
186 Risk Score

Malware Insights

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

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 0.9997

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/wix?keyword=abbreviation+for+master+sergeant PDF link annotation
    • https://kovozewiridudu.weebly.com/uploads/1/3/0/7/130738567/vanevemajisapumasewi.pdfIn PDF document text
    • http://nedobujivub.22web.org/11747025310.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/8914154.pdfIn PDF document text
    • http://nesobaka9.xyz/browning_trail_camera_btc-_5hd_manualzr4kg.pdfIn PDF document text
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/zesufelasedepeladew.pdfIn PDF document text
    • https://nixovutak.weebly.com/uploads/1/3/1/4/131406963/5568960.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/ce0741.pdfIn PDF document text
    • http://vwwv-avito.online/80573105422wc4ds.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/cu_boulder_engineering_transfer_requirements.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/moxalonajojewebajup.pdfIn PDF document text
    • http://itgermany.net/east_horsehead_lake_fishing_report8dloi.pdfIn PDF document text
    • http://woodlesenka.ru/contract_law_basicsadxo7.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/1145316.pdfIn PDF document text
    • https://dodapufil.weebly.com/uploads/1/3/0/8/130813701/068447b7734d.pdfIn PDF document text
    • https://sowofofum.weebly.com/uploads/1/3/2/8/132814146/roxusovufuv.pdfIn PDF document text
    • http://madewithsunshine.com/angularjs_header_footer_templatejl6d2.pdfIn PDF document text
    • https://lupilizeranal.weebly.com/uploads/1/3/4/4/134460298/xulivakonupi-bazogokajuj-jafabidex-pebeposufaberiz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kedokonox.rf.gd/zunupesuxomozudog.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/jipeletizores.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/which_baby_bassinet_is_the_best.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_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 5032 bytes
SHA-256: 24b35c9eabb00a5c27f7847f681cb7f5139709ce660843126e974516f92d1340
font_01_sfnt_off000117bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BC 15396 bytes
SHA-256: bbcd9d101ea6bfdbfbd195c0aff430acb539304f21eaa65307b8b058a051aeb0
font_02_sfnt_off00014939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14939 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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