Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7d7905fd063d7d…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 13:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 145cc815953ade57c6064399a21c63e5 SHA-1: 88d49737e7d0a8b2a16ed26d9d2c2b0f3e33defd SHA-256: ff7d7905fd063d7d5ed00fa0fbc663349a61f8d56e95041c61468e93090b1b19
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs, with a prominent one pointing to 'midufefew.ru', suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of embedded URLs and the overall heuristic firings strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://midufefew.ru/wix?keyword=sperry+wire+tracker+manual PDF link annotation
    • http://sakulog.sportsontheweb.net/2017_chevy_malibu_premier_led_headlights.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477376/normal_5fc64b399765a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408319/normal_601ed738c34da.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/william_shakespeare_sonnet_73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367643/normal_5fedc8e42307d.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/what_is_the_gpi_of_an_arrow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_601aab0db6e82.pdfIn PDF document text
    • http://pusovemolexed.scienceontheweb.net/schwinn_bike_trailer_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464303/normal_6040b8c919320.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_85be4a40e238494faaa0ee6e157233aa.pdf?index=trueIn PDF document text
    • https://2e4d99de-9d37-4ce2-abd5-0bbccafdbe51.filesusr.com/ugd/33a2e4_ea15ce316b004d16ada979f888c87800.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_f76316cff62b49f991a4bb2250f65973.pdf?index=trueIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_9530513b1d85495788d72d85373f2acb.pdf?index=trueIn PDF document text
    • http://xopapikalemeb.rf.gd/antigeno_ns1_dengue.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_cbf0605e935741d6b1a027f130557166.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_e667ccebf91a4d8793ecd1358e1ad5db.pdf?index=trueIn PDF document text
    • http://kekabipiji.rf.gd/rubber_calender_machine.pdfIn PDF document text
    • http://vimevuda.rf.gd/42712715585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2414c23c-e116-49a7-9e6f-99bbde8813e7/rofiteragesa.pdfIn PDF document text
    • https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_42b3d01c933742be8cc483734308d3ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ee96679-9a95-4a5d-9f87-96d56df01c74/67390538002.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_96ae42d425ed455d88c2eeefe829e067.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68127f99-0967-4703-959f-1e63e51776b1/what_is_tawhid_and_prophethood_in_islam.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_92830af78f5648c0b9e7400f45d1c47d.pdf?index=trueIn 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_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 5260 bytes
SHA-256: 12d65d1a06f1097d843943d874a1cf843d8cbf90f30532a0d09374f36800a977
font_01_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 11728 bytes
SHA-256: ac9ce1cd8d25980d00573f3e0d57a620149e0abd51b2868697987ec6631ae035