Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a136c819e2fe58b…

MALICIOUS

PDF

78.0 KB Created: 2021-03-19 21:24:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b5b8ca197a8ea4386dbf3ec7e87ff1d7 SHA-1: 691a7a06be1049dab42b41af7b9d8d060f38c49f SHA-256: 3a136c819e2fe58b811543575d18d321881cac8480ecc1cbecdc6e918cecd5ee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a high number of embedded links, many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous external URIs suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=how+long+do+brakes+last+on+a+ford+explorer PDF link annotation
    • http://usersonlineguardingsettings.site/marooned_movie_1969_castbx5ha.pdfIn PDF document text
    • http://1-bog.ru/37065451770obmma.pdfIn PDF document text
    • http://xodowomasugis.iblogger.org/88114946499.pdfIn PDF document text
    • http://olymp-trade.top/what_is_regurgitation_gerdfjbha.pdfIn PDF document text
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/1389656.pdfIn PDF document text
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/4009283.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/1981212.pdfIn PDF document text
    • http://usecabinets.xyz/gavijugapokuledrd6e.pdfIn PDF document text
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/rimakudoruxiwogas.pdfIn PDF document text
    • https://zetozegazironik.weebly.com/uploads/1/3/2/6/132696155/bamos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/solonebosop/d_d_3._5_complete_arcane.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/anari_1959_full_movie.pdfIn PDF document text
    • http://jodewejuwuw.epizy.com/mri_anatomy_knee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a32b18-0cd7-4f53-bc9c-5114ec1f1b9e/81272822977.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87065975-22ec-4a90-a77a-a1a990cd3032/how_to_factory_reset_kenwood_ddx373bt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b5f596b-34aa-40fe-a4dc-a37af3cb0c0a/thunder_cake_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a25b77d5-f874-4ffe-8071-c856c66828a9/teviruwet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae7ece1-8a96-4e4a-b206-ef267a29f4b4/how_to_bend_a_2_inch_offset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33b9bec-d7bf-4511-9933-4093190b6513/44089037399.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/funai_dvd_vcr_combo_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4284862-5a57-40b3-85e7-6501e4486bf7/why_my_frigidaire_microwave_stopped_working.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_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 5536 bytes
SHA-256: 9640e2f75cc817c2b2f738bdbbd8fb27ea38656b177c473c1f5eed043d8ab4b1
font_01_sfnt_off00010539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10772 bytes
SHA-256: b7e8dae22440cc450ac1635119efdb384999504108c41a1051487368ff4937d3

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