Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a77ca9cb91796c9…

MALICIOUS

PDF

67.9 KB Created: 2021-04-03 06:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 27da2743a211b930760022dacf13140c SHA-1: 99c03c84634de5f675c2ef29d203e6d35e4e623c SHA-256: 9a77ca9cb91796c9c7ea012b0abeb327b9ceaecd61a1384ab1b981990114720e
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a primary focus on 'https://xezojetit.ru/award?keyword=between+two+worlds+book+pdf', suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a garbled attempt to present content related to a book, aligning with the lure strategy.

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://xezojetit.ru/award?keyword=between+two+worlds+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370286/normal_5ff57c613bf37.pdfIn PDF document text
    • http://nowijito.22web.org/android_version_9_zip_file.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472186/normal_602876b849b3d.pdfIn PDF document text
    • https://litazotivov.weebly.com/uploads/1/3/0/7/130740097/a19b7e.pdfIn PDF document text
    • https://wevejabunom.weebly.com/uploads/1/3/1/4/131406075/5642622.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_600bb99b806de.pdfIn PDF document text
    • http://jozipuvuwuzaj.mywebcommunity.org/critical_care_nursing_a_holistic_approach_10th_edition.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/87191766495.pdfIn PDF document text
    • http://wosozage.mypressonline.com/bacteriological_analysis_of_drinking_water.pdfIn PDF document text
    • https://xupemapimosow.weebly.com/uploads/1/3/0/7/130776757/2473632.pdfIn PDF document text
    • http://joweponula.mywebcommunity.org/toyota_corolla_verso_owners_manual.pdfIn PDF document text
    • http://doxedisipi.scienceontheweb.net/handball_bundesliga_spielplan_18_19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391308/normal_603e397e3972a.pdfIn PDF document text
    • https://tobadagagu.weebly.com/uploads/1/3/4/7/134750152/norapurimug-difedoserofox-fogeten.pdfIn PDF document text
    • http://banademebilite.sportsontheweb.net/catalogo_cedulas_do_brasil_download_gratis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenakezogutomu.onlinewebshop.net/english_speaking_learning_books.pdfIn PDF document text
    • https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_5924656b09514a34a3f07655d8ccafa1.pdf?index=trueIn PDF document text
    • http://vipuzala.myartsonline.com/aterosclerosis_causas.pdfIn PDF document text
    • http://vafitinupisojud.onlinewebshop.net/abnormal_child_and_adolescent_psychology.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_1b15fbf7db8b428e87abb6ee76e24dba.pdf?index=trueIn PDF document text
    • http://betakudo.atwebpages.com/22527495541.pdfIn PDF document text
    • http://revisinek.epizy.com/67282350147.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_6eefa590ebfd4d839e47602c70bd4e67.pdf?index=trueIn 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_off0000cb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8C 5168 bytes
SHA-256: d88e7dc6c0a1c4ce86771106c96a20e886f2ed4208a2ffe8d4b9edda04459421
font_01_sfnt_off0000dd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD41 10356 bytes
SHA-256: 18e3d26186773b6662cae26694408c6aa653351116a577d7bb8cf329a1bac8ae

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