Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2cb548353d1b56…

MALICIOUS

PDF

111.9 KB Created: 2021-04-07 18:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f8040c70f9cc34e0f83f01253cbee8ff SHA-1: e667d1c0dda541ac801de9ddfa0cfcc24a811540 SHA-256: 6b2cb548353d1b56ee41156670f12fa662d44ede86aaf0e1dbb9fefb9f06b00a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point to a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/123?utm_term=datasheet+pdf+ne555 PDF link annotation
    • http://luxshop21.site/supulunobunenexufiziki8nbt7.pdfIn PDF document text
    • http://trellos.fun/buried_gianto4cpk.pdfIn PDF document text
    • http://nuverlites.online/39125036231snd2e.pdfIn PDF document text
    • http://bonmarket.site/namonegenazozabojomuwexafmo2z4.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/fjggcVN/48974882215.pdfIn PDF document text
    • https://bosebekepomij.weebly.com/uploads/1/3/4/8/134870535/xonexogelasar_zasavekebuxibi_lotozebututef_vumonoba.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/quadratische_gleichungen_lsen_aufgaben_mit_lsungen.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/giNVEjh/trap_bunny_bubbles_rapper.pdfIn PDF document text
    • http://xovebud.mygamesonline.org/diccionario_de_americanismos_2020.pdfIn PDF document text
    • https://nupimixek.weebly.com/uploads/1/3/2/7/132712066/4601370.pdfIn PDF document text
    • http://lienforkid.com/milk_and_honey_by_rupi_kaurf4jig.pdfIn PDF document text
    • https://litunuvojiv.weebly.com/uploads/1/3/0/9/130969221/xavokij_dokuluberu.pdfIn PDF document text
    • https://cdn.sqhk.co/tojofelekob/eIghQjj/vehicle_colouring_book.pdfIn PDF document text
    • http://lg-copyright.com/android_studio_multiline_comment_shortcut3qi6f.pdfIn PDF document text
    • http://top-odejda.com/zifotiloluwawiziloxby7k3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://562a32fb-e9c8-4d8f-ac7e-a760da58c396.filesusr.com/ugd/68ec97_9a9b54212200451f8aec77b8ffbdab6b.pdf?index=trueIn PDF document text
    • https://c20a02f1-eded-46de-afbf-2d7328e03b26.filesusr.com/ugd/c6fd25_605fc42d50224154bb6db6aa36a4c75a.pdf?index=trueIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_ef0f6ffa734e49b5a5dba3619e19369c.pdf?index=trueIn PDF document text
    • https://be9ca920-c372-4566-b00d-544f92814f3b.filesusr.com/ugd/f0c5a9_6136b31dcc6c421790602e55f10de0e9.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_5416a86158a442eb9c8e16e42f181b5c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C36 7004 bytes
SHA-256: 1f9d700ba287c80703e69b85af8d3fc1542640f240eafb12593e2d8555e5ef9d
font_01_sfnt_off00015454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15454 4752 bytes
SHA-256: 9bbae71345c610110760a61da707721438e016ac52dd779759c9c6c81265f241
font_02_sfnt_off00016478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16478 12524 bytes
SHA-256: 0411fd5250ef23e011b814031ac5b535580859512be4d908da55dc42cc12c017
font_03_sfnt_off00018f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F16 16064 bytes
SHA-256: 530ff5b075befe60ee741b28edfc3ef5dbe104a983a394340679dcffc81e9b6b
font_04_sfnt_off0001a3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3BA 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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