Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f73725aa3cc9325…

MALICIOUS

PDF

155.3 KB Created: 2021-03-29 02:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a63d7107588931b561dba14e59bb5d22 SHA-1: 596d6d77609ebf70ea807bc09ebaa3dd050a30c1 SHA-256: 3f73725aa3cc9325df5d00f5aa524993a95ca69c8325a5ef84f26ccd3ae56ef7
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 embedded URLs pointing to suspicious domains like 'resalured.ru' and 'trelon.fun', which are likely used to host phishing content or download further malware. The document body, though heavily obfuscated, appears to be a lure related to academic search terms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://resalured.ru/award?keyword=actor+critic+reinforcement+learning+pdf PDF link annotation
    • http://trelon.fun/826054987734t7vj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_5fda58d70dc6b.pdfIn PDF document text
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/fa23058f1910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_604425d559dad.pdfIn PDF document text
    • http://policyhelpcenter.com/footprints_without_feet_extra_question_answer_edumantraxhaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_600da4f56a793.pdfIn PDF document text
    • http://naturebiolog.space/90841682110mx23f.pdfIn PDF document text
    • https://bubituzujolumet.weebly.com/uploads/1/3/4/6/134647672/2d4df.pdfIn PDF document text
    • https://jipofaxinevafud.weebly.com/uploads/1/3/4/3/134350183/lozafeloduwifog_talexetos_zenake_rawajesafokaja.pdfIn PDF document text
    • https://katopogovalasa.weebly.com/uploads/1/3/5/4/135401177/1aeda87a19c4.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/a2f17140-cede-42d3-80d3-6c305c402134/brother_mfc-7360n_printer_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83935b1c-b422-4a7c-8d7f-0ef9e77f32e2/xeruweso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0242a6d8-30ae-47d7-9a11-2196cffd7427/tom_clancys_rainbow_six_siege_gold_edition_ps4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e9bd61-fabd-4d9f-8fe4-0ac6037a6041/red_rising_book_chapter_summaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51d7e3b8-dd0a-452e-8216-a280cc70f192/clasificacion_del_derecho_privado_y_publico.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/baumanometro_manual_san_pablo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42866372-6673-436c-8a4a-2f23c577d23b/41054577306.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/xojapebazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5cec07f-bb07-4728-b863-3356c845413f/togomaxupu.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/73723070073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b15666-ce59-4404-b5a3-7f52c42b53c4/xobiledoj.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/12197942924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fd5c83-42c4-44db-8feb-2839f2351fe3/zowirukajaxomaropaze.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A74 65804 bytes
SHA-256: c7dcc3815cc57412842b1b4a85b543406489694de3050769ff8a60acf51c788c
font_01_sfnt_off00022623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22623 5284 bytes
SHA-256: 9231b7226a199ac42640afb27116b5e8deb17355f9266c253f9b345b39927528
font_02_sfnt_off00023808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23808 10848 bytes
SHA-256: 6c16423f483e2e1dea77b4a8ae56b1bd43118184c572ca2fc614cdb045dd40a9