Malicious PDF — malware analysis report

Static analysis result for SHA-256 418156912eadc3af…

MALICIOUS

PDF

100.5 KB Created: 2021-03-02 03:31:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9c41471d3f09e1acf933ce5fa5445cf1 SHA-1: dff2baecc850497d1bd9ad7aba071cf6c7bdc482 SHA-256: 418156912eadc3afe5900d9bab6b41b85045f9f8eb2d9f396a66515dedcf6506
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://fokemale.ru/strik?utm_term=the+house+on+mango+street+pdf+spanish PDF link annotation
    • https://sifajovu.weebly.com/uploads/1/3/4/8/134874608/1ab0cccad39bce.pdfIn PDF document text
    • https://xuxamiwi.weebly.com/uploads/1/3/4/6/134624415/lojutufafedubuwuvep.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/2GLhjgi/89572864901.pdfIn PDF document text
    • https://petodudugagakot.weebly.com/uploads/1/3/4/6/134640630/2543968.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/4185296.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/6d875.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/selenium_python_tutorial_youtube.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/Gifchax/herpes_simplex_virus_encephalitis_radiology.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwuwedelo/1BicjiS/water_slide_for_sale_el_paso_tx.pdfIn PDF document text
    • https://cdn.sqhk.co/rijatazuga/fPhjihG/what_time_does_nascar_race_tomorrow.pdfIn PDF document text
    • https://cdn.sqhk.co/kewixoretuze/Cheqjcj/58385645819.pdfIn PDF document text
    • https://cdn.sqhk.co/lewikokezina/ghijjii/girolulagumax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://danebusuji.onlinewebshop.net/49377595017.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/el_caballero_de_la_armadura_oxidada_resumen_y_analisis.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/how_to_transfer_a_call_using_nortel_networks.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B69 5372 bytes
SHA-256: bfec7ddc3f4ea1e49f06aeb14894735bb0571371b8811dd545bb201b963f7d19
font_01_sfnt_off00015d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D86 12248 bytes
SHA-256: 2deec5d946c6a693145f9e80e6ca7a32b96e842228496df0567e3c60125fe3d4

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