Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf27701347171c9…

MALICIOUS

PDF

77.6 KB Created: 2021-03-19 04:27:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 691e815b2fb34aec4e068b2a72f83210 SHA-1: c4b54bc30518ef5ea0872e2d88d281f0336aa5d5 SHA-256: 3cf27701347171c9d493022567f0b261b3a1402e7aef6da94aad3467916d5cb6
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. The ML classifier and ClamAV heuristic firings strongly indicate malicious intent, likely for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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=basic+punnett+square+worksheet PDF link annotation
    • https://cdn.sqhk.co/gewewoturila/Mge4lhi/glowroad_online_shopping_with_price.pdfIn PDF document text
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/fuxosimuwuner.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/catching_fire_full_movie_free_on_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/taxodisilif/xhXlTha/car_parking_game_for_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/uihpStF/10124719577.pdfIn PDF document text
    • https://nowuvufeguxebib.weebly.com/uploads/1/3/2/8/132814980/susoz.pdfIn PDF document text
    • https://cdn.sqhk.co/busumodofu/jahhihP/police_scanner_codes_mckeesport_pa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481275/normal_5fd799d81529c.pdfIn PDF document text
    • http://rezanufeku.mygamesonline.org/49643668222.pdfIn PDF document text
    • https://cdn.sqhk.co/nomowaxiwo/e8giYhg/81617974570.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476954/normal_5fde61ab61bd9.pdfIn PDF document text
    • https://cdn.sqhk.co/jifibipex/kjj1jiO/best_data_vault_app_for_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/jecgeij/novozidivifajojuxovawosu.pdfIn PDF document text
    • https://zememaxuzibur.weebly.com/uploads/1/3/5/3/135326459/19626f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/52efbbfa-902d-4afd-879b-332552ee065d/how_to_teach_an_older_person_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dd4010b-5df3-4c10-bec1-b10adf48c00d/bigger_leaner_stronger_eating_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e576481-a895-44d3-98c0-ae41b2ef0838/kuxipit.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_off0000f17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 5320 bytes
SHA-256: 993d9ca9aa59bb8fb4a760ac00f75d9ae4b2672985cbcd2df4603fe91a0ec9de
font_01_sfnt_off000103ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AB 11072 bytes
SHA-256: 2fc836d05a08d8e84afc18d48b254816dacebdba030933673c1b6de34e0de899

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