Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f056e3d6c06853…

MALICIOUS

PDF

69.5 KB Created: 2021-02-28 16:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c395aca694912f92328d18a5378a26e2 SHA-1: 45c8975cbf738e70b62a5f80dbad7e26ce617109 SHA-256: 52f056e3d6c0685352d2c7b07e22ed138943129c1694f7641066d2a5b18c192a
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one specifically pointing to a suspicious domain that appears to be part of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains a query about nutritional information, suggesting a lure to disguise the malicious intent of directing users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://baarspo.ru/award?keyword=how+many+carbs+in+burger+king+medium+onion+rings PDF link annotation
    • http://zikewexer.scienceontheweb.net/11856501038.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/how_would_you_describe_a_christmas_tree.pdfIn PDF document text
    • http://glossywp.online/tania_raymonde_malcolm_in_the_middlegzcc6.pdfIn PDF document text
    • http://tersq.fun/movie_review_presentation_rubricbncm6.pdfIn PDF document text
    • http://fisutef.iblogger.org/hey_mama_variya_song_masstamilan.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/Wjcjb34/heroes_circle_jamaica_crab.pdfIn PDF document text
    • https://berisojelo.weebly.com/uploads/1/3/0/8/130874511/naliwisu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pikubub.onlinewebshop.net/python_pandas_excelwriter_tutorial.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/why_my_laptop_cant_connect_to_wifi_windows_7.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/how_to_use_breville_air_fryer.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/daxomuvulanemisa.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_off0000d2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FD 5584 bytes
SHA-256: bc81f6109f89bac99fe28339e0b18399319024abb81056a164328974d1da2e18
font_01_sfnt_off0000e5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F3 10232 bytes
SHA-256: 5d16662f0237df2eed8d43db78d0919e65ae6e15d98fae3f39d5ba44b3b2f952

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