Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aa9bc02a277b6ff…

MALICIOUS

PDF

75.8 KB Created: 2021-03-11 02:23:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b4541bfc3aa9964ea55e3aea065549ab SHA-1: b8634201fd9288571d16494b53c18b731f1e0a5b SHA-256: 5aa9bc02a277b6ffd590ed10648ac3a2a1167cff2c7b36fcb066e8c17dd625dc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to 'answer sheet pdf' and application metadata, indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://leonvi.ru/award?keyword=sat+2+answer+sheet+pdf PDF link annotation
    • https://cdn.sqhk.co/lokalofobox/iM4Whdt/liwuwasolofisafebireka.pdfIn PDF document text
    • https://cdn.sqhk.co/kotafuli/thdbQgg/kaxuzoxutafaxizupu.pdfIn PDF document text
    • http://xevedudox.sportsontheweb.net/amadis_de_gaula_portugues.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/DpEhcii/free_digital_marketing_strategy_template_2020.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/solving_linear_equations_review_worksheet.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/79383582344.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/UhfeO2g/mansions_of_madness_2nd_edition_first_scenario.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413454/normal_60307eb98b894.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447467/normal_5fcb67f919125.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/test_angielski_b2.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/a30e28b5-c9e0-43ed-99a8-7a35c9702066/86320759955.pdfIn PDF document text
    • http://jagodadevigusef.rf.gd/12788404023.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c37173-4d31-42b4-9728-30e74b9b41d3/rinnai_heaters_direct_vent.pdfIn PDF document text
    • http://muropij.epizy.com/kagoxufafagase.pdfIn PDF document text
    • http://kevusej.epizy.com/forsaken_tower_osrs_guide.pdfIn PDF document text
    • http://tetigod.rf.gd/16569700150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c4c008-70e6-451f-8d15-c63d0c7e2711/ford_mustang_mach_e_gt.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/waterproof_fitted_sheet_double_bed.pdfIn PDF document text
    • http://wesatume.atwebpages.com/kozapilafizuzuxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a118d0bf-05ef-4d86-830d-f40996641990/new_age_spiritual_stores_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c550f3fe-c161-4ead-a6e8-46898a215a71/14543781716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50c3433-f5d7-4965-b9c8-c723dc26da9b/le_petit_prince_mont_blanc_pen.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_off0000eab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB4 5424 bytes
SHA-256: a8652503854808b4a2534b10fc2a1095e9b780874c569ccf1b6a54937499b45b
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 10760 bytes
SHA-256: db66d164adb6512aeeb6df86adae50f583f0d39e3a724ac933491818285b38d3

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