Malicious PDF — malware analysis report

Static analysis result for SHA-256 8441dbdafc602b5d…

MALICIOUS

PDF

68.8 KB Created: 2021-04-07 04:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d64fd8427fe936c92e26b4103dff6f4d SHA-1: a97babd99a2e1db7a8c2eab7573326a3adb09f61 SHA-256: 8441dbdafc602b5d61bc28fca08000b09a4acea22b64157363521c8afffa444c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive link farm.

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://jumiwimov.ru/award?keyword=cambridge+primary+english+activity+book+1+pdf PDF link annotation
    • https://cdn.sqhk.co/nonuripot/sjjghb3/37079583752.pdfIn PDF document text
    • http://vikusegapaf.22web.org/12018120031.pdfIn PDF document text
    • http://mamubisuk.mypressonline.com/59000443759.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/ejggdgh/39465667030.pdfIn PDF document text
    • http://rigares.iblogger.org/bread_making_process.pdfIn PDF document text
    • http://pewadulojuba.mypressonline.com/mirerujojafobi.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/hjQwMsS/jamaica_news_radio_stations_online.pdfIn PDF document text
    • https://cdn.sqhk.co/livefivepa/jiJybGd/fox_theater_banning.pdfIn PDF document text
    • http://xepiluwe.22web.org/xunemexewid.pdfIn PDF document text
    • https://cdn.sqhk.co/pafevola/DicgfDG/71149878119.pdfIn PDF document text
    • https://cdn.sqhk.co/wodelaganav/vYjagjL/37580057803.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/ieAjeEU/face_changer_video_app_ios.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/beyond_biocentrism_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dupugozub.epizy.com/14246172065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0f1d9f-3108-45ec-a9d1-c0bb77252c50/nuseniwerilowezezis.pdfIn PDF document text
    • http://wefuzage.epizy.com/55129171149.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379aa401-087e-438e-8f2b-e4a039ff36d2/manual_de_primeros_auxilios_2019_peru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d481142a-c11a-44ff-93b3-4212f60ebd22/mazezavozinutujokojozaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34964f13-dfa7-4409-b5a9-ac1088d95f4e/wepanurubewomas.pdfIn PDF document text
    • http://pixagese.rf.gd/21463173103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8cf857-85f1-4e8b-9131-8cb1267d25a9/46958343606.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_off0000cef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF3 5892 bytes
SHA-256: a7bd436ba55ce2725f011e8854ea2038408494077feba220720becaa56d878ad
font_01_sfnt_off0000e2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DE 10296 bytes
SHA-256: 11dab254b4bb9f4de0b895b1ca7fc98d721cd2091963e9f586a64bbaada557e3

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