Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08cb8fa8543bae5…

MALICIOUS

PDF

85.9 KB Created: 2021-03-24 10:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 98ff0faffa1ec400b5b17df4e34f07d8 SHA-1: 9553135f643593a62b89a2b68a46eaf46cfeacb2 SHA-256: e08cb8fa8543bae5e85c94c57c5be3c66df5cf2332df4de43d204c87c0747931
86 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the heuristic indicating a QR code lure suggest a phishing or redirection attempt to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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/strik?utm_term=4g+lte+cellspot+setup+video PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452392/normal_60073d3633000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fdab6b421b41.pdfIn PDF document text
    • http://zakewabo.scienceontheweb.net/87736822795.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_6025a55fd632c.pdfIn PDF document text
    • http://mudikovarew.mygamesonline.org/45351872429.pdfIn PDF document text
    • http://kafofal.mygamesonline.org/ninevatabasozusimomolu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470687/normal_6000248ebb8a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425738/normal_601de3e5e37fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485001/normal_60230f4740b81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_6003a6bc8daa0.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://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_63b786007a5c404bba4a07ed9573b7fa.pdf?index=trueIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_4ec45ce4749040fd83736ac311859932.pdf?index=trueIn PDF document text
    • http://fapugiv.rf.gd/client_approval_form_sample.pdfIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_f26200e50ef04452b48006f02b33cc55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/089db8b8-fdd1-41bb-994c-311be458fae1/68495237783.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/american_gods_season_1_episode_3_synopsis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8272c18-3480-4359-8c59-496c5f1aa987/how_to_use_a_midea_pressure_cooker.pdfIn PDF document text
    • http://guriseb.myartsonline.com/70968825545.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_76dd210f5f5742d3aa1e4320c03f3191.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_e98049818b7b46e49eb622a6e54a22f9.pdf?index=trueIn PDF document text
    • http://relamelekubapan.epizy.com/futumagunupuwawufuje.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_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 4764 bytes
SHA-256: 3b344e6d550f972236cb89b85e6ba0d629f1434fd32a27f58ea8d16c0fae1f46
font_01_sfnt_off00010005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10005 11232 bytes
SHA-256: 6c55699cd450999752503d85a24930886c4cca6f5530a6bb93a2a38ac7816228
font_02_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00013b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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