Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0323a053f6542f0…

MALICIOUS

PDF

84.9 KB Created: 2021-06-08 02:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 12009ecdd0e839b2f061ea4dd7c452cf SHA-1: 294aebadacff7085a9990155ec7847647230931d SHA-256: f0323a053f6542f086bc21b6349d67e9798f13fb97d48e84888886c16a4f61b6
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to reference search terms, suggesting a phishing lure to a malicious website. The presence of external URIs and link farm heuristics further supports a phishing 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://ketchas.ru/pbw?utm_term=data+structures+and+algorithms+in+python+book+reddit PDF link annotation
    • https://fataleripe.weebly.com/uploads/1/3/0/9/130969718/123fe70debb0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_6033a7ae78afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421629/normal_6055cac0f1d04.pdfIn PDF document text
    • https://ralakugifobiw.weebly.com/uploads/1/3/4/5/134589758/zovogime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fosirodovo.pbworks.com/f/58156737805.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a4638a2-1565-4705-806c-343a2ac51e94/mtd_snowblower_carburetor_rebuild.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626bf2de-29f9-421f-a16a-f19cdd2b0094/fly_tying_desk_accessories.pdfIn PDF document text
    • http://magogopowo.pbworks.com/f/en_que_consiste_el_proceso_de_destilacin_fraccionada_del_petrleo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39a85f06-09b0-479f-a8ce-cc8052936b0e/59021904092.pdfIn PDF document text
    • http://gazoridixilu.pbworks.com/w/file/fetch/144524211/rigefujoxeneduwefif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbc5ed7-0e24-4850-9673-368221f1f963/john_deere_z950m_seat_cover.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/w/file/fetch/144822693/69319102372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dff1312-299f-4888-be06-e1363161242c/lasemuvi.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144434598/shadow_fight_3_hack_ios_2019.pdfIn PDF document text
    • http://bevojoluvu.pbworks.com/w/file/fetch/144448581/nexedinaxojuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16599eb0-e9bc-49a0-9330-e1de5f9bc40b/what_is_thermal_energy_storage_materials.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/what_is_hills_prescription_diet_a_d.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_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 5792 bytes
SHA-256: a6cfe0c384454d6c92bf11fc1ba909862f6560b59126bd0ca9c7c25ec6c2baa1
font_01_sfnt_off0001204f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204F 11120 bytes
SHA-256: 770f5fa6f6d8a294ef5c384a2459e55dae4a79f8776ff02bd7cecabf89818ca4

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