Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4dbe3eca81d193…

MALICIOUS

PDF

112.6 KB Created: 2021-03-22 11:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6fb6c4e140dfcea892ab3a9668b0da62 SHA-1: 492f2e1a91b7ab851efe55349cf3a168cb064e76 SHA-256: 7b4dbe3eca81d193cbef3b63bad5e9c30c49c899cef787fe2b12fcd7d8e97efc
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, likely intended to manipulate search engine rankings or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or SEO spamming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=etiologia+de+insuficiencia+cardiaca+congestiva+pdf PDF link annotation
    • http://cadenalia.com/mallampalli_weather_reportmw8rb.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/Ikih0gg/spy_game_online_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxapivasif/ggdgfic/yahoo_mail_organized_email_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/jiYhjig/nipijukobomofogabanakuxa.pdfIn PDF document text
    • http://bestrongbyg.com/survival_games_2021bliti.pdfIn PDF document text
    • http://prizinsta.info/kezuveladuxaxadsgzh.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/jcidhjd/marketing_coordinator_jobs_denver.pdfIn PDF document text
    • http://apple-fruit.space/sujeraa04o4.pdfIn PDF document text
    • https://cdn.sqhk.co/fegokirar/ZARLxdX/foxojefiponi.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/jhh6jfm/92294771281.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/cidLqif/bezoregenevuzugefonuxu.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/24c4d849-81f9-44c8-b4f8-e889ed47397c/2179780807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7366a9b-e0d1-4b76-bdd6-67c3f7f331a2/lasko_ceramic_tower_heater_5521_manual.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_0795eec1dc35442da9f8870afba3656a.pdf?index=trueIn PDF document text
    • https://65de77fc-0341-4fd2-89b2-cd6b005a91de.filesusr.com/ugd/cf79db_abb531d0807c42eebd772b9957fdf2d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9d9248-fb5e-4a9e-b4a3-6b8258c92271/dd_5e_advanced_weapons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b1a3bdc-53d3-41d7-8b2a-d161e9c3ad77/nancy_drew_castle_malloy_dolls.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_7fb6d1b77ca247e18dc58b0cd289a93c.pdf?index=trueIn 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_off0001757f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1757F 5340 bytes
SHA-256: b0b0f15903a17b6ba652555c2f5a73a34af7717f88b1f5692db29af4dcb7a337
font_01_sfnt_off000187ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187CA 13252 bytes
SHA-256: b73c6b72bf7f9edef3442d16800bab8009ef9f1b34eb006c5e57ab9a4b047e69

Open this report in the interactive analyzer, or submit your own file for analysis.