Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf06a632fcafc955…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 15:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d12cbcaee08fb89cd21ed69228989f97 SHA-1: 5582a292124181b5d8b970a9dfa5107e40a71d7a SHA-256: cf06a632fcafc9556291384015e1637e3108513455c73881cb9e786b6b1b2f17
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/wix?keyword=a+transparent+cube+of+15+cm+edge PDF link annotation
    • https://medivurufif.weebly.com/uploads/1/3/1/4/131407406/00261d5e33.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/2569e8a9874.pdfIn PDF document text
    • https://pusixeraz.weebly.com/uploads/1/3/2/6/132681440/kaponivakilux-zijigosa.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/bjcegje/dizakolufisis.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/fcNARKa/webakugosek.pdfIn PDF document text
    • https://puwakama.weebly.com/uploads/1/3/4/4/134474688/143ac1f8e6.pdfIn PDF document text
    • http://ostanni.fun/196449831407me1w.pdfIn PDF document text
    • http://pitushok.fun/a_streetcar_named_desire_scene_3_important_quotestv0id.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/gecPAs9/lesson_plan_software_free_download.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://bivixogerixud.weebly.com/uploads/1/3/4/4/134469213/belokowo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/0776440b-e065-404c-a1bc-567aca9447ff/fipizekuwosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6204398b-e139-4a34-bf42-7b00482f11f6/17721138361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01e2aec4-59a7-411c-b0d6-319d96e4216f/arduino_ide_change_language.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/15901153856.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/reading_graphs_charts_and_tables_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b591dd25-61e9-4718-8c94-b924956ce411/how_to_enable_adobe_flash_player_on_chrome_mac.pdfIn PDF document text
    • http://linakagiwabofa.epizy.com/kurisidagize.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/82251968377.pdfIn PDF document text
    • http://nigezedebojiwe.rf.gd/96376689368.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00daf8df-f3a6-404a-937b-8edd8d7a2883/tolagezesikuluruzu.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/hada_labo_shirojyun_sheet_mask.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/requirement_specification_template_software.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBF 5748 bytes
SHA-256: 7a88525f8c0dfa6164a4513d8b48bda2e6fb4defdabe016caad985dc21936c07
font_01_sfnt_off0000e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13C 11276 bytes
SHA-256: 1c268ec6c8a0246d3957e801cee280d83e52a2b37033f740965bf210bd08edd9
font_02_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 16240 bytes
SHA-256: 369f8dde818102cc5176bb263bb368cba564a31857c8a2763d0a468fe5fddcff
font_03_sfnt_off00011d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D04 5376 bytes
SHA-256: c7c2e34358b12156cd855b987a979d58bd84feb9f66b48229d4139b63d9e00d4

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