Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9ed857a5ae31d05…

MALICIOUS

PDF

71.0 KB Created: 2021-02-24 23:36:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 399314a4dd8ba9756f27bb15c7c57c3f SHA-1: 0036dd4b24f861488e9adcfdc0707aa726ae7936 SHA-256: e9ed857a5ae31d05a60cf1acdb8c30e418c6eaae3ef7b2458e74bb5244b45fdf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it acts as a link farm or redirector to distribute further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a tactic to obscure malicious links.

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://jacksth.ru/wix?keyword=mcgraw+hill+plant+transpiration+virtual+lab+answers PDF link annotation
    • http://bas-vorota.ru/pathfinder_character_sheet_packtv5q2.pdfIn PDF document text
    • http://fofoketezifofi.22web.org/toyota_corolla_verso_2003_manual.pdfIn PDF document text
    • http://tryporte.xyz/25473577221y72w5.pdfIn PDF document text
    • http://wekejenepes.22web.org/obusforme_mattress_topper.pdfIn PDF document text
    • https://kixivoveluvib.weebly.com/uploads/1/3/0/7/130775150/f1cd0e639449.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409425/normal_5ff780161a9c7.pdfIn PDF document text
    • https://kapelasijad.weebly.com/uploads/1/3/4/3/134312752/maparem.pdfIn PDF document text
    • http://thesimplycompleteseries.com/beach_party_craft_summer_high_school_adventure7v466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392666/normal_5fe2e71b57aa8.pdfIn PDF document text
    • https://nobakunifiximup.weebly.com/uploads/1/3/5/3/135310199/e3bb92521.pdfIn PDF document text
    • http://bio-ita.fun/avg_antivirus_windows_10_free8r7ug.pdfIn PDF document text
    • http://datujizid.iblogger.org/40853307713.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/baofeng_uv-5r_manuale_ita.pdfIn PDF document text
    • http://teagreen.space/rocky_mountain_climbing_center_bookingrl4q0.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/3ad5e.pdfIn PDF document text
    • https://fiwarurebel.weebly.com/uploads/1/3/2/8/132814972/fbe08f51.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://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_off0000ccac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAC 5376 bytes
SHA-256: 4eb21d873a62b183b254e479f71a72e8a22a586bebf1a4dc55b885e44bbd6899
font_01_sfnt_off0000df04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF04 9828 bytes
SHA-256: 2f52eef705e92e9564623a3b1500bd0efdb7f2f01b7556b9066250b40afad15c
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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