Malicious PDF — malware analysis report

Static analysis result for SHA-256 36279dc5a8367249…

MALICIOUS

PDF

80.3 KB Created: 2021-03-17 03:55:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 05658c5be5b7197f9443793daa16a894 SHA-1: 7894e8d7fccbfbd5f7ea2c30c03d16b7be7f4306 SHA-256: 36279dc5a8367249d341ccc95b4a384b450a8c21433396daf150ccc4b401c5f5
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to a suspicious domain ('golowaki.ru') flagged as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of external URIs and the overall heuristic firings suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/award?keyword=antimoniales+pentavalentes+pdf PDF link annotation
    • http://fosipuzo.mypressonline.com/vasidaminizur.pdfIn PDF document text
    • http://homeolimp.com/hp_photosmart_7760_photo_printer_driver_downloadurm6o.pdfIn PDF document text
    • http://allfreebets.ru/466154301983pdf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fe6c6a2aa4dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413375/normal_6023d5a786b22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_603d7e6b29b41.pdfIn PDF document text
    • http://tranquils.space/jarumuwanexuk17yg3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416786/normal_6046162719dfa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46363415-8290-4dba-beba-eff7551800f8/how_to_find_cylindrical_volume.pdfIn PDF document text
    • http://nekelaxowe.atwebpages.com/aws_elastic_beanstalk_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b1a98c-ff71-4c52-a6cc-7f520173dde8/86599328073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3bd5395-3b0c-4fbb-b84f-be84abce3828/romeo_and_juliet_notes_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzakob/brother_mfc_6490_ink_cartridges.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/what_affects_density_altitude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc885710-6116-4f75-8ae5-67990ad69f51/michel_foucault_power_and_knowledge_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/miwumesixazegasiluzapuran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87b93439-2e7b-455a-8910-aaf5f4bf2980/kivajixibiwavif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65ef854c-9f3e-46ba-914e-d5c9c92ff235/99786377292.pdfIn PDF document text
    • http://tibutariwu.myartsonline.com/l_amore_ai_tempi_del_colera_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDF 5140 bytes
SHA-256: 9dd9d1d8b53afd47e51bdd1ad1c12cfc86bd55cecfd4f4b5eb74c1e31784c009
font_01_sfnt_off00010f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F55 10852 bytes
SHA-256: a17bdf560d5ad43521570ebeab828bfdc78dbc36abd5b03b1051745611612679

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