Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81dfee879a5fd12…

MALICIOUS

PDF

79.1 KB Created: 2021-03-17 20:44:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5cff697c3f0ee79f62d2f91643a9d688 SHA-1: 07eccc787ed2a852493bbccf62d5a013e01a775d SHA-256: b81dfee879a5fd12a59bea2d602a9b60d8e69a5022fe8f556510b85f1e2e8bdf
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing users to 'lozipotod.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://lozipotod.ru/123?utm_term=android+sdk+and+avd+manager+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369775/normal_603bc54e3c957.pdfIn PDF document text
    • http://app-3null.com/diy_paper_craft_ideas_easy_paper_flowers_2019f6tfl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489587/normal_60343b8572034.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402294/normal_5fde870a0c567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_603549c649e63.pdfIn PDF document text
    • http://astrohelp.space/software_reporter_tool_chrome_high_cpu9mz1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_6011aa6847c31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6030885c082fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484995/normal_603d98c512760.pdfIn PDF document text
    • http://winoorama.fun/96732320154aubnr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozisez.rf.gd/pasifanopaxuxojem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccb9aa0d-ecfb-4054-9440-cd57b0cfe4af/the_vampire_diaries_books_set_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1911d03-9f85-4760-82d9-6e0b527aac77/como_hacer_una_ficha_bibliografica_de_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc91464f-25ea-4833-8efc-d98f6ea3923e/34302896241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a502f7c3-f0b3-4552-8e19-b33ffb9aaf8f/beats_solo_2_wireless_reset_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42c339a-73c5-4412-a00a-0508ebdd5c55/53523792467.pdfIn PDF document text
    • http://lobinobunametiv.rf.gd/f_c_l_ka_full_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62536920-2247-4972-a31d-958dc008e036/harry_potter_y_el_prisionero_de_azkaban_20_aniversario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88aa71e8-1005-4290-8379-e281773f0454/gegipobamekepar.pdfIn PDF document text
    • http://lavavil.rf.gd/zus_car_key_finder_manual.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 5308 bytes
SHA-256: e4edade373584d322681c26efce3f2765a33bd92c934d6b409bddc2533b5b21d
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10812 bytes
SHA-256: dd5b2ddacaa5620b3b9d75b34abe4880d89c4a45e661294ba4337a9e01ba60ec
font_02_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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