Malicious PDF — malware analysis report

Static analysis result for SHA-256 375811ee0e45101f…

MALICIOUS

PDF

69.7 KB Created: 2021-03-28 15:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 750e1c503e0be42c5531c4028a1e2767 SHA-1: bac6619fa1df377767054f61db0ef37edcd300d1 SHA-256: 375811ee0e45101fac86f9f10a50b16e9b8fb0403d1497eba13c8656c5473aa8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an external URI pointing to 'pelibifir.ru', which is likely part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=patofisiologi+anemia+penyakit+kronik+pdf PDF link annotation
    • http://originalhallyu.com/supaninufie8zp1.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/wifevutuzofi.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/cyberpunk_red_classes.pdfIn PDF document text
    • http://gixitetopes.scienceontheweb.net/ladelofusiwilumubilavutel.pdfIn PDF document text
    • http://labebatazavanoz.mygamesonline.org/calligraphy_letters_design.pdfIn PDF document text
    • http://catsism.com/fundamental_rights_in_constitution_of_nepal_2072_in_nepaliul7ph.pdfIn PDF document text
    • http://bopolubolef.mywebcommunity.org/xezuresedinurusisen.pdfIn PDF document text
    • http://kudikadip.getenjoyment.net/montgomery_ward_upright_freezer_manual.pdfIn PDF document text
    • http://lexanizisujufum.66ghz.com/15500188220.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/mAghWia/misurokusupagezugofuw.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/birlemi_milletler_art.pdfIn PDF document text
    • http://dostafood.xyz/937714100744tpza.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/jegesi.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/H9igTjd/dr._web_security_space_life.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/1a55e6c8-8918-461e-a36f-c1b6c4c4cd3f/agresti_2002_categorical_data_analysis.pdfIn PDF document text
    • http://lovifepomuxi.rf.gd/80243724388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbcef6d4-e6cf-474a-8d3b-503f408c7baf/personal_balanced_scorecard_definition.pdfIn PDF document text
    • http://kubuxakul.epizy.com/ms_excel_exercises_for_students.pdfIn PDF document text
    • http://sopavame.onlinewebshop.net/titekop.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/adobe_premiere_2020_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee403881-6940-4d8e-9050-62529c7a45bc/vodemazijudutesadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a237c04-68a1-4c45-9588-d84680528b16/68709485627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ffd0dcd-e4a8-43b0-b500-69ffdf4a293e/68488409422.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_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 5528 bytes
SHA-256: b0a8b1e97983258d8e804ae9d2a78593be06c92eff147b1ea19325356e9d90ff
font_01_sfnt_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 10076 bytes
SHA-256: 39555c3bbf4c4cdbd5d346f21b1c41ccfdc7b9e1cd82213ea8c64e7e968456a9

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