Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf66d8fef202ce5…

MALICIOUS

PDF

72.3 KB Created: 2021-02-03 10:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b3f0fd6f665e1e617bd4758c656325ea SHA-1: 6d6c80fffad99959767303bbe3f6d880cf4093eb SHA-256: bdf66d8fef202ce5110a0d467e09486a7e9c5f28871cdd57376beaf204e4f102
124 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classification and heuristics. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document structure is also flagged as a link farm on disposable hosting, suggesting a distribution mechanism for malicious content. While no scripts were explicitly extracted, the nature of the embedded links and the overall structure strongly indicate an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/aws?utm_term=encyclop%25C3%25A9die+visuelle+des+plantes+sauvages+pdf In PDF document text
    • http://zawizazoxof.iblogger.org/12190762308.pdfIn PDF document text
    • http://reduslim-italiaofficial.site/bavevigcikcd.pdfIn PDF document text
    • http://vvinorama.website/wulinivesopusipid7beus.pdfIn PDF document text
    • http://playmarket-online.com/glamour_photography_poses9lqhk.pdfIn PDF document text
    • http://goodnaturak.space/2016_camaro_ss_manual_0-60lau0j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5fe41c2c6e79f.pdfIn PDF document text
    • http://womenita.fun/sceptre_tv_remote_code_4_digit0t4sp.pdfIn PDF document text
    • http://regsen.website/carol_of_the_bells_piano9gjho.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojosire.epizy.com/26772869043.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/27609204493.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/fibiwebiju.pdfIn PDF document text
    • https://s3.amazonaws.com/wovitiku/soya_bean_production_guidelines.pdfIn PDF document text
    • http://tokavasetalan.epizy.com/nutrition_information_albacore_tuna_steak.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/38350162725.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/yeezy_boost_350_v2_sizing_guide.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_off0000d7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 5488 bytes
SHA-256: b08972b2f574cedbe503711e504abe2682bc50f8edaddf038d8504500c9af5f3
font_01_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 12352 bytes
SHA-256: effa96c9f5c45d5aa452e4975bec68d53aef980ecc76775429c412023a9bda84

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