Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f4a3284e8e355f…

MALICIOUS

PDF

70.9 KB Created: 2021-06-08 13:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fb0135848814e7b30963e30eb3045fb2 SHA-1: 13a8a4a61e5decda098f4cbac78719316602b1dd SHA-256: d6f4a3284e8e355f0a48475956286779236c60455fd1db426bd3cb223148cc3f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'irlanc.ru', suggesting a phishing lure. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/pbw?utm_term=possessive+pronouns+exercises+pdf+primaria PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4388428/normal_606e570921ac3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450045/normal_5ff9389231e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_600b227a85968.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/afad8146-e9e8-45a6-9cab-fcedd96ec2bd/voxegogato.pdfIn PDF document text
    • http://degagogo.pbworks.com/w/file/fetch/144615591/tejefemexaduxafemabav.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144503742/tixokojusagugemitefize.pdfIn PDF document text
    • http://fepazonavu.pbworks.com/w/file/fetch/144868440/megadrox_and_testadrox_side_effects.pdfIn PDF document text
    • http://biduzoku.pbworks.com/w/file/fetch/144657483/exercice_accord_sujet_verbe_ce1.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/sipokatodosolibelosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ff3081-a836-42e9-937e-296cce7a806d/tuxemokafikegukir.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/how_to_read_refrigerant_pressure_temperature_chart.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/vatisogetawanis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40826d7-6afd-47fa-95f9-4031dc386a49/choose_your_own_adventure_game_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0cd79a-8900-4af6-b9ec-067487443823/what_is_the_name_of_180_degree_angle.pdfIn PDF document text
    • http://wukexav.pbworks.com/f/bojadibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d7c9491-1d1b-439d-acd2-9fac6e88cdef/53056187472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acd05d6-104e-4e74-8f57-7f64e8bc711c/microsoft_visual_basic_programmers_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668a957e-a40a-4f7b-853c-8868a2d62161/pupikanafirediwe.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/how_to_draw_a_mountain_landscape_for_beginners.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/74355425946.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/89312330131.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/potebigozajapegumifu.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_off0000d628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD628 5400 bytes
SHA-256: 8b7ab9b530f6e1b15149d158a2c0237e5b64d4c1da8e99629154fb04f94c84e5
font_01_sfnt_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 11520 bytes
SHA-256: b76cea842fbb0ab9e0a662ca68aef669af4198cc72e99cca67c50ff4181ad7a3

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