Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d22437b219ab61d…

MALICIOUS

PDF

88.0 KB Created: 2021-04-18 05:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 3d3f81937385f36616b17484379ff3c5 SHA-1: 954428d8794c6000badeb209c683b16a2196e92b SHA-256: 1d22437b219ab61d30d31c40b20e35f3ee1886b35f76bb85e154d5ffa5a2e1d5
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to drive traffic to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/strik?utm_term=wall+street+english+student+reviews PDF link annotation
    • http://magonawaneku.22web.org/nutrisi_hidroponik.pdfIn PDF document text
    • http://cosmicgig.com/rowajunilawonafilnct91.pdfIn PDF document text
    • http://iblack.space/11117582265bznen.pdfIn PDF document text
    • https://lowexupunodod.weebly.com/uploads/1/3/4/8/134896298/8357126.pdfIn PDF document text
    • https://vimefipivarek.weebly.com/uploads/1/3/4/3/134310944/1072509.pdfIn PDF document text
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/dakatakala.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465537/normal_60297a5226257.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404500/normal_6007fcaa766a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409614/normal_5fcc99eff2460.pdfIn PDF document text
    • https://defelidiko.weebly.com/uploads/1/3/1/0/131070982/tazaxuxod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_603ef93862e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_5fe7852853b48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_60170b0345dae.pdfIn PDF document text
    • http://sfr-espace.best/massey_ferguson_35p36ck.pdfIn PDF document text
    • https://nazoxuja.weebly.com/uploads/1/3/2/8/132814973/gevavaripigixu-mupodejumipa-nefolunufowami-fidubig.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479688/normal_5fed2bf8f4070.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevopidonas.epizy.com/how_to_program_baofeng_uv-82_for_police_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/tezude/ririjovisezomokomudi.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/99664409245.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/how_to_work_omron_blood_pressure_monitor.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/how_to_program_solace_remote_starter.pdfIn PDF document text
    • http://webemorukosor.epizy.com/attached_dr_amir_levine.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/kekibomujojavemeworek.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_off000118ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FF 5252 bytes
SHA-256: 4f3f427456b7ce7dbf7b827c2365f2f01c0d82bd3bf903d096a3d349b2b62bdd
font_01_sfnt_off00012aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AEB 11576 bytes
SHA-256: 6d76c09215fcdf8411f8b7e8148c1a6ec7cfa40a13481ded9157618fa1175e40

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