Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f20df594d330eb…

MALICIOUS

PDF

68.2 KB Created: 2021-06-13 18:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 92b52d2d73f8d533411182e35292e532 SHA-1: c2f4a547b19054360e8560346d8ce5884c05dae7 SHA-256: a5f20df594d330eb0b0b6d8731024c9b648bc3e775ba38841bee615975a3c6bc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://pistant.ru/pbw?utm_term=bca+microprocessor+notes+pdf PDF link annotation
    • https://lawanirixuxevu.weebly.com/uploads/1/3/4/4/134444287/6823223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_6039b652151be.pdfIn PDF document text
    • https://katalulipof.weebly.com/uploads/1/3/2/7/132710678/molasivovoneb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4859805/normal_6031954ca4720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gatasulupu.pbworks.com/f/easy_turkish_grammar_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dd87a7d-694f-41a7-8430-7cdcf4ca76f1/sanubukijozubegep.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144660384/rirorafabuzimizobaja.pdfIn PDF document text
    • http://juvudibip.pbworks.com/f/jumaga.pdfIn PDF document text
    • http://wibajeku.pbworks.com/f/the_accountant_movie_download_720p_dual_audio.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144941640/75872574182.pdfIn PDF document text
    • http://zafobagusaz.pbworks.com/f/printable_reading_materials_for_grade_1_filipino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eae69412-5a11-43e4-8043-94d557574e62/how_to_take_body_measurements_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf8358f-89c8-4db5-9515-9fd02375d835/tuxuruzigagilibumumebene.pdfIn PDF document text
    • http://sezipakupuw.pbworks.com/w/file/fetch/144794274/nadra_voter_list_download_2020.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/62471136028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15c701a-3e44-45ff-8643-afb2ed0b84e6/arbys_melt_sandwich_nutrition_facts.pdfIn PDF document text
    • http://todenulaw.pbworks.com/w/file/fetch/145059846/87841475082.pdfIn PDF document text
    • http://mujefefimuf.pbworks.com/f/64645160341.pdfIn PDF document text
    • http://kufujibumufa.pbworks.com/w/file/fetch/144413400/calidad_productividad_y_competitividad_deming.pdfIn PDF document text
    • http://xetuduju.pbworks.com/w/file/fetch/144674892/kigizivepifa.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_off0000cded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDED 5320 bytes
SHA-256: 8a8f3583f5e514869d49b277554412844af9ab25dc89198be896567741e60beb
font_01_sfnt_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 10448 bytes
SHA-256: b642cb531fef8f947d1fe9e49ba36514bee4d1541b8ccfb9c06a4793fa1df9aa

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