Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3352c354dfd0664…

MALICIOUS

PDF

83.2 KB Created: 2021-03-22 15:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 913d1f9eee7b50e3b4276fe961f4e400 SHA-1: 9595db1078c257362079a37680d6d22e646b45d5 SHA-256: f3352c354dfd0664ee5e1654f7d6fee20790b076e63624cb41c6caba7b896bef
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-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://kuzutuzo.ru/strik?utm_term=kidde+smoke+and+carbon+monoxide+alarm+model+kn-cosm-1b+manual PDF link annotation
    • http://ufenmac.com/mustang_fender_05-098a4pz.pdfIn PDF document text
    • http://waxedeb.getenjoyment.net/naguduwapiv.pdfIn PDF document text
    • http://espaceclient-cmb.com/bet365_live_streaming_androiddpih5.pdfIn PDF document text
    • http://neuroncraft.online/fenix_2.0_vaper8xbb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490542/normal_600a5cd6e7595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_603d1a452fa1d.pdfIn PDF document text
    • http://creditactive.info/tewexozewawilodobwqgy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_5fda792f34c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_6050407d87768.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/71124056328.pdfIn PDF document text
    • http://xeratigike.medianewsonline.com/37462190100.pdfIn PDF document text
    • http://d-youtube.com/36017454379evy4q.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/6e2d22db-bb58-42ef-b8d6-29c01146ec8c/how_to_trade_earnings_gaps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7319fe1-fbd1-4f52-b0a9-ca8975b08ba1/solucionario_del_libro_fisica_universitaria_volumen_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60e4928c-e16d-45a3-824a-b2443990355a/cuckoo_clock_repair_salt_lake_city_utah.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84d7622d-9c80-4169-b1b1-6ac8382c5b8f/popabunusidelirefumogugal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff2f838-4406-4085-b041-7c9fdd268c92/92174577101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fa17ce-df67-4245-b641-36badeff31e8/gukumurapunegiti.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/zigijozami.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_off00010428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 5412 bytes
SHA-256: 3f377a043a21e3d77b963fe896b5ab8d7ac48e470ea86303f2494c80cf3b4f78
font_01_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 11384 bytes
SHA-256: 35f4e75a0e9ab5cb350a82338d2f162b786e6ed9b4a2bc5b7e555f30cfe87a99

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