Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d668c98f696bfd…

MALICIOUS

PDF

76.2 KB Created: 2021-05-05 15:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 20d7a188a560f35ae873b8cc7e677709 SHA-1: 24913a5a6fcedc583cb67dd1dab19b26a4db3cf5 SHA-256: 86d668c98f696bfd87b5eb786a446a7886e2bc4e3aeb3976dd41dd946eac76ca
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to known malicious redirectors or are part of a link farm hosted on disposable infrastructure. The primary malicious URL identified is dafemum.ru, which is flagged as a redirector. The document body, though heavily obfuscated, appears to contain text related to journal prompts, likely serving as a lure to disguise the malicious intent of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 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.
  • 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://dafemum.ru/strik?utm_term=journal+prompt+ideas+for+high+school In PDF document text
    • http://zebozewazogaso.scienceontheweb.net/azure_az_100.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_b860fad3cc494cabba5c4827fc7bebf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbc69e26-757a-49ab-bc49-640de55c12ba/44422032058.pdfIn PDF document text
    • http://najexenij.onlinewebshop.net/bash_bunny_manual.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_4575ddc06d28477589dd7db76ba2622a.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_7217ce84df9749cd9da762a1cac7e75b.pdf?index=trueIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_8d0b513d4dfd4c718d5b3b0455a995a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/314a60b2-4398-45af-9637-fff78fb1c7cb/how_to_use_monster_smart_app.pdfIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_c2203ce1442f4b7bb01d3521d54545c6.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_12952e7b20ab4962911f75febcdb8f3e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83edc1f-c600-48e4-963a-89965303b4b6/46068313609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e2fb06-ad04-4cba-ab98-a9d2ae02242d/43504369732.pdfIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_26c8b0e965fd4e9686850b0a00b4ffb2.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_95a6fd19908b4cfea9c599e5f16725ba.pdf?index=trueIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_a2e0d5b1d5334377b8ee0dbc4a5d35a5.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_2a5bdd81f5844a72b4efe6482a49751c.pdf?index=trueIn PDF document text
    • http://zepizevut.atwebpages.com/67359252653.pdfIn PDF document text
    • https://aefb6378-f3ca-470a-b9d2-22936542d087.filesusr.com/ugd/fe129c_ef678f14824846d28df9954735b4e381.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_62b56a0323eb4058ae5c7d3de0f00935.pdf?index=trueIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_c22fe60b44f64713b18eb380c762e715.pdf?index=trueIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_d1e3e9317d0c4b00914e3bc14df45426.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_off0000eca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 5556 bytes
SHA-256: c51cf31c973c2387f6e878906ff67bedd7321f1e04cb8e2c476fdf46627b491a
font_01_sfnt_off0000ff5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 10648 bytes
SHA-256: a2f2c9402c83d4b31d33655464972801cb5091a643be62ab65498de3d52fc8d9

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