Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0c597e425035cc…

MALICIOUS

PDF

85.8 KB Created: 2021-03-25 06:12:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 85853d4f45ca1f33ecbf2af67cbda29a SHA-1: 5938e0dc9db96ab41872fa61b7d67be3573ed65a SHA-256: ef0c597e425035cc05127f592790734246b75335089aab557108bb5f585f656c
126 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 phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/wix?keyword=declaration+of+independence+break+up+letter+video PDF link annotation
    • http://libuwapuvewipev.mywebcommunity.org/how_can_i_contact_fedex.pdfIn PDF document text
    • http://wulutapebime.getenjoyment.net/78900311343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5fcdc76846dc4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414502/normal_5feb73730162c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427103/normal_600b63c580fdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412768/normal_5ff76a122c287.pdfIn PDF document text
    • http://tejafugap.22web.org/kumiponawixosasamasofukur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448121/normal_5fdfadd056849.pdfIn PDF document text
    • http://gazeloguxa.22web.org/artificial_insemination_in_swine_in_the_philippines.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://uploads.strikinglycdn.com/files/77758c70-4541-43c5-811c-25550040ad90/tumejederefanabugujikiga.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/96816860180.pdfIn PDF document text
    • http://wawikoduvebakap.onlinewebshop.net/97007503157.pdfIn PDF document text
    • http://wugijin.rf.gd/34823479840.pdfIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_867e3f182192411f9932c86c9515d9a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/01deef0f-b30b-40b2-9248-331edf9567f5/mushoku_tensei_light_novel_wiki.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/9980079132.pdfIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_4b2344f250874e10a137130312f19890.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/78f43aac-c299-4a8e-aaa7-b635c9e4a863/why_is_my_kindle_fire_not_holding_a_charge.pdfIn PDF document text
    • http://vaxoponawa.rf.gd/nofivosopedono.pdfIn PDF document text
    • http://tuxizosog.rf.gd/aufgabenstellung_formulieren_masterarbeit.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE547 5116 bytes
SHA-256: bd49ef1aba9704f77f2dd63cd4e94994512611a7e08e8cd6a3dc2b7f9c3cf18d
font_01_sfnt_off0000f6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B2 1800 bytes
SHA-256: 6d2a3a16cc464ce72cf05976c7f96a31c93af2202e0dc760c37a694345e222ee
font_02_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 10828 bytes
SHA-256: a6230f639199bcd8ace6932021bd84f18bf065c0f67392322e55e2382cc872fd
font_03_sfnt_off00012482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12482 16312 bytes
SHA-256: b2563e85233037e3c2780690ed1455257f868516b5a962e54e6ffe29314c9cb1
font_04_sfnt_off00013a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230