Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41ec3c854d8d80d…

MALICIOUS

PDF

84.9 KB Created: 2021-03-03 19:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6f3c2115d5fd17ae10a5838ae5a7051a SHA-1: d6f9156a2d938cbebfb6bffc1d86cd5300532436 SHA-256: d41ec3c854d8d80d2186d88e3fb33fc83074a1177d25b2bd2b619b37308afe0d
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely attempt to manipulate search results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=stanford+dschool+design+thinking+process PDF link annotation
    • https://cdn.sqhk.co/meduxemij/fkgdgdr/birdy_grey_reviews_bbb.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/iAjafgf/xafuk.pdfIn PDF document text
    • http://fishland.store/bobufolizavirasolktq9n.pdfIn PDF document text
    • http://new-leggins.site/unified_portal_epfo_java_settingsxjbki.pdfIn PDF document text
    • http://lnstagramservicecopyrights.com/spanish_civil_war_1936f8748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_60015ead8c8a8.pdfIn PDF document text
    • http://frankiearvelo.com/party_attendance_list_templateya96i.pdfIn PDF document text
    • https://cdn.sqhk.co/sesexibanobu/jfhhggC/35561186082.pdfIn PDF document text
    • http://xegazinijitup.mywebcommunity.org/bomubogedofuluwofixiku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446263/normal_600925e0e1b93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5fe5a06e6e3bb.pdfIn PDF document text
    • http://azorocheat6.xyz/97349095419qvgyk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421641/normal_5ff5f949626ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451047/normal_603a6874589c6.pdfIn PDF document text
    • http://thedouche.xyz/poulan_chainsaw_carburetor_rebuild4mkf2.pdfIn PDF document text
    • http://uuuuull.space/entropia_universe_melee_guideghohc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529780/normal_601322fe3c339.pdfIn PDF document text
    • http://genoray.pro/39276854145fc346.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
    • http://lumosaneja.onlinewebshop.net/is_there_a_winning_strategy_for_roulette.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_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 5372 bytes
SHA-256: 7ccc93d8f85d99cd07d49eaac13aec329540a62537df422f978e2101b3d513a9
font_01_sfnt_off00011076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11076 11588 bytes
SHA-256: 342129062787585c223e012de3345321a0706553a0d68e0631573d574d68bcd4
font_02_sfnt_off0001379c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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