Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa60e534fd4aaa2…

MALICIOUS

PDF

78.4 KB Created: 2021-03-27 15:11:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c8c628861e263a286404f14784a7538 SHA-1: 83be2e42502210ef93667b14b50ea61a5b04c62b SHA-256: 3fa60e534fd4aaa2a680bb8b0146d027b620bf1f8840887fceb9f5c9d8643d8d
66 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious attempt to redirect users. While no scripts were explicitly extracted, the presence of many external URIs and the ML classifier's high confidence score point towards a malicious intent, likely to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://cdn-cms.f-static.net/uploads/4370780/normal_60371aa0aa499.pdf In PDF document text
    • http://flebolog24.com/764897914241e4n7.pdfIn PDF document text
    • http://baranaydin.org/can_a_wood_burning_stove_heat_the_whole_houseb7qx6.pdfIn PDF document text
    • http://pokezokebawi.mygamesonline.org/5264625444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481285/normal_5ffe6333b3a85.pdfIn PDF document text
    • http://dejepuzalew.mygamesonline.org/freepik_cv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_5fd8abe8eb569.pdfIn PDF document text
    • http://karaulovlife.site/xiririsefumuls36v.pdfIn PDF document text
    • http://power-guard.shop/narrative_report_for_buwan_ng_wika_2018q45kq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417992/normal_60497d9a8088f.pdfIn PDF document text
    • http://inscarusa.info/7th_grade_math_angles_worksheets2nxgz.pdfIn PDF document text
    • http://svoydvalend.xyz/difference_between_android_and_windows_operating_systemf4qid.pdfIn PDF document text
    • http://erogan-oficial.site/how_to_get_cell_reference_in_excel_vbas75dh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456389/normal_600d4aa048381.pdfIn PDF document text
    • http://xegisepereti.mygamesonline.org/admiralty_jurisdiction_act_1991.pdfIn PDF document text
    • http://timelessdecorum.com/bounty_chocolate_nutritional_informationjiit8.pdfIn PDF document text
    • http://limons.space/87655668455pbwfq.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/3314741781.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464874/normal_5ff231eb9aa54.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://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=det%20goda%20samh%C3%A4llet%20bloggPDF link annotation
    • http://lawewil.atwebpages.com/35683359240.pdfIn PDF document text
    • http://sivikonalijuto.myartsonline.com/33564096097.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 5152 bytes
SHA-256: ddbdf59b550cbbf85d6a69b712eb2ff95a59b8d51904ed18cfe10dbf801711ce
font_01_sfnt_off0000f840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF840 11360 bytes
SHA-256: 25254545cd009eafe9499b185d3956e1d624a43fa96927118d86a567c2495ad5
font_02_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 4324 bytes
SHA-256: ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c

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