Malicious PDF — malware analysis report

Static analysis result for SHA-256 735a8675cd913a23…

MALICIOUS

PDF

69.3 KB Created: 2021-03-29 01:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1788bec059d18c9311b4898b0ce6d17e SHA-1: a2fd58de902732a1e751e05b8d7d16f35238f02d SHA-256: 735a8675cd913a2392d0bb949efc4aa5457fed87266e1f55403a33d43bf70c60
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links pointing to potentially malicious or disposable domains, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain academic-sounding keywords, suggesting a lure to disguise the malicious intent of redirecting users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://yafferge.ru/123?utm_term=covalent+bonding+webquest+answers In PDF document text
    • http://cheapkeys.site/hermetic_kabbalah_tarot6hml5.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/big_easy_turkey_fryer_instructions.pdfIn PDF document text
    • http://kidufamipowanot.mywebcommunity.org/jogefu.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/az_900_dumps_free.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/h1_keep_on_the_shadowfell.pdfIn PDF document text
    • http://all-gopro.com/graco_duoglider_swing_hattieep3w5.pdfIn PDF document text
    • http://cryogen.me/962245062796gs8o.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/aafa5ec5-0ca5-4e5f-a23a-0ea39b783f6a/lisajuwo.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_6d2d2b01baa0492aa3aaef591abfa7d9.pdf?index=trueIn PDF document text
    • http://nowimirozox.atwebpages.com/enfoque_psicosocial_del_desarrollo.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_dc2713586d664ebfb4bb9b1fb2cc9d41.pdf?index=trueIn PDF document text
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_fd20660654964a6b8e4d03acba5b895f.pdf?index=trueIn PDF document text
    • http://litabasiker.onlinewebshop.net/ciencias_sociales_y_humanidades.pdfIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_a88b415bda5342cf9febd01091c9cbdf.pdf?index=trueIn PDF document text
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_7e3a6f0beaae4b7c9501e2ed7964d2d3.pdf?index=trueIn PDF document text
    • https://caa91486-5fcc-43b7-8b2b-5b817ae85bbe.filesusr.com/ugd/26bbcf_917a49d091c447899e84cc9551bfd4b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/667e780b-6ba4-47e2-b0e1-283cb2f87c9e/pl_sql_coding_conventions.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/genetic_causes_of_epilepsy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ae2d96-a5ce-4ae6-85d4-155ecd4715a5/49330856464.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_off0000d2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B4 5316 bytes
SHA-256: 7503dd4161e73ec70e9a3334e35c2cdc0921d28c546dea07cbeb4ce4b77142ca
font_01_sfnt_off0000e4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DB 10356 bytes
SHA-256: 4e0391a04b37b9944cb9927c97e9fa04664ee6409a8eaa9235ab094313296bb1

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