Malicious PDF — malware analysis report

Static analysis result for SHA-256 7abd811b9d9aee93…

MALICIOUS

PDF

81.8 KB Created: 2021-04-02 10:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5b16a4d51ee4fb7aa6f1404975ae8c1f SHA-1: 668168654f5b7d2c562b98b341fefdbb37f70443 SHA-256: 7abd811b9d9aee937b6346bb40eb45463dafbd0b5cf21bea8f6c2ddbab07875e
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links to various domains, some of which are hosted on disposable platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious or phishing content, disguised under SEO-related topics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=what+are+the+best+coding+languages+to+learn+2020 PDF link annotation
    • http://salimom.mygamesonline.org/58130494064.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/aBfgihj/g_voiced_or_voiceless.pdfIn PDF document text
    • http://busapibasin.mypressonline.com/17656908548.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/ichizX2/gravitrax_cyber_monday.pdfIn PDF document text
    • http://gumidaz.medianewsonline.com/does_td_ameritrade_have_penny_stocks.pdfIn PDF document text
    • https://besajiti.weebly.com/uploads/1/3/1/8/131856076/c1cf1e14.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/Tjihejc/6372655431.pdfIn PDF document text
    • https://nasoxatexiwek.weebly.com/uploads/1/3/0/7/130739087/e5817289.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5fc7ab3d3bc82.pdfIn PDF document text
    • https://tuboxivodase.weebly.com/uploads/1/3/4/3/134387713/wifotukirakajitinu.pdfIn PDF document text
    • https://fagovuwafarawa.weebly.com/uploads/1/3/4/0/134042706/bokudepavi-vapizuwopat-danixevanole-mozonuwam.pdfIn PDF document text
    • https://cdn.sqhk.co/rawewosit/EIXXOhb/physics_toolbox_sensor_suite_pro_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_605da5fae11d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481424/normal_6013bca080efc.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fuBEHOL/kiloblocks_lite_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/gcLibjk/7484482538.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/jUGifTe/23942638783.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/33220764667.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://pizitibasowu.atwebpages.com/contract_agreement_document.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/navy_technical_jobs_2019_advertisement.pdfIn PDF document text
    • http://muluwokixo.onlinewebshop.net/gubumu.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_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 5512 bytes
SHA-256: 2ae4967307fe1047c8b4f97a90a231841624920129661319b059da9aefe8140d
font_01_sfnt_off0001069f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069F 10844 bytes
SHA-256: 542594ee2a39b8a9540809f07b3bc81e666b867ff2ecc3b808d608debaadd4b6
font_02_sfnt_off00012ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378