Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d4a8535940a954…

MALICIOUS

PDF

68.7 KB Created: 2021-03-30 05:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 667c3b3ce455c47a0a9b0941bcc16355 SHA-1: e6bcfc54887fb29fdcc99c5fbbcc267a50e1788e SHA-256: 60d4a8535940a954370d0c557a88d49b69d34df34c2eadbdaace9384f788ec55
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 0.9992

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://crophysi.ru/strik?utm_term=organic+chemistry+as+a+second+language+first+semester+topics+pdf+reddit PDF link annotation
    • http://dirozigumifew.scienceontheweb.net/correspondance_albert_camus_maria_casares_espaol.pdfIn PDF document text
    • https://bejixetixozivi.weebly.com/uploads/1/3/4/4/134499198/wenanibewe-wibodumezagirib.pdfIn PDF document text
    • https://mifadugusukar.weebly.com/uploads/1/3/5/3/135337027/fc80afd11.pdfIn PDF document text
    • http://tivepijezar.22web.org/22770871226.pdfIn PDF document text
    • http://femetorisufi.sportsontheweb.net/potugufusesudikenazup.pdfIn PDF document text
    • https://rebodegumirimak.weebly.com/uploads/1/3/0/7/130775130/1714071.pdfIn PDF document text
    • http://texewofe.22web.org/fpsc_jobs_challan_form_2018.pdfIn PDF document text
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/387886.pdfIn PDF document text
    • http://wuroguredogir.getenjoyment.net/ebstein_cardiopatia_congenita.pdfIn PDF document text
    • http://xexogafuko.22web.org/widusawiz.pdfIn PDF document text
    • https://bewokeramubi.weebly.com/uploads/1/3/1/6/131636949/625949.pdfIn PDF document text
    • http://meroxisawifagu.mygamesonline.org/58841247552.pdfIn PDF document text
    • https://milixugaxezo.weebly.com/uploads/1/3/1/8/131856079/621f42.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/pilebuwonokeza.pdfIn PDF document text
    • https://voximarabot.weebly.com/uploads/1/3/1/3/131383255/fotizuru_kurajagidexofa_kabaguwoj.pdfIn PDF document text
    • http://zujejilolo.scienceontheweb.net/80670251913.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/sanebuxaf.pdfIn PDF document text
    • http://falisekivi.iblogger.org/anahtar_kelimelerle_eitim_bilimleri_2020.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/c8d820075efb64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ginowane.onlinewebshop.net/samsung_galaxy_note_20_ultra_in_india.pdfIn PDF document text
    • https://f92484db-e5b4-41f8-9431-508412042773.filesusr.com/ugd/b04c15_d1630aea3fb04211bd81c0b1a99f0a63.pdf?index=trueIn PDF document text
    • http://waviwonagasa.epizy.com/learning_mit_app_inventor_2.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_873dd6c26afd4a07b6bba504a9540056.pdf?index=trueIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/bipokukuba.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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 5700 bytes
SHA-256: 8535bc45f7224b036910eafd7b6df02852469e8f0af1c647c87ef1fa55f7da57
font_01_sfnt_off0000e14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14D 10476 bytes
SHA-256: 5e7c89350ce833f21ef0ca1dcd773b518010bd607c06b3869aae5b99206ed2a0