Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f8520fe0f700f3…

MALICIOUS

PDF

74.0 KB Created: 2021-03-28 04:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 453b0895f3c6c428953086439d7a0244 SHA-1: f65554ad4a3221d6e3569f2c9b36a04dd87aaadb SHA-256: 12f8520fe0f700f30c0583b03dc7e68e786a0ab034d9bd1c3e85d6b0dcca9fbc
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'https://kuzutuzo.ru/strik' which is likely a phishing or malware distribution site. The PDF's structure and the presence of many links suggest it functions as a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=how+much+do+lawyers+make+in+new+york+city PDF link annotation
    • http://fedajoxoxa.iblogger.org/bapafu.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/72872360641.pdfIn PDF document text
    • http://towexiwi.sportsontheweb.net/bonosovus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://benamow.myartsonline.com/practice_sat_math_questions.pdfIn PDF document text
    • http://pizibajavodup.epizy.com/11859274607.pdfIn PDF document text
    • https://4c5ad993-366d-4b3a-aa99-9b6f56583180.filesusr.com/ugd/01e791_fe476beaf291404fb86d58be09fc9c1e.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_ca1f918c68d7411b94eba2f5227ab650.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_e13f0bb5b128400a9d83f5a5d5c77eea.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/what_is_meant_by_pascal_triangle.pdfIn PDF document text
    • https://s3.amazonaws.com/gatazeromij/an_imperial_affliction_book_peter_van_houten.pdfIn PDF document text
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_b991728559a2459eba7f7f0e61f498ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/7722351817.pdfIn PDF document text
    • http://widusop.atwebpages.com/renal_tubular_acidosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fef927bb-b64b-462e-9de1-d9c8f09c45c3/vuzuzemupirobozafejobavi.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/best_android_games_with_controller_support.pdfIn PDF document text
    • http://pajimej.epizy.com/banobonuxukirigabukeko.pdfIn PDF document text
    • http://lubepigufig.rf.gd/30589669173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c46252cc-b59b-483c-a226-633928bfcbf8/34662292139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58621dc1-a0b5-4d86-a111-bac63fc2b5fc/mitofibironotupego.pdfIn PDF document text
    • http://suvowafavij.epizy.com/nutotumewode.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50F 5280 bytes
SHA-256: fe0391e8550c9a8c27c0008fac7b9f0c357a525d8440ff3bfc2267ca2c32ea51
font_01_sfnt_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 10788 bytes
SHA-256: 970fd3ff913ed6e711c88e24e219f671906bd8ec8404211c9b80b4035dcfe12a
font_02_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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