Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65d477f1db2b0b7…

MALICIOUS

PDF

100.7 KB Created: 2021-04-05 21:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9b6203355eff71d1cc32cb2831862bf8 SHA-1: 999ea3a032f84659ffb447b1a6a77846a94467ab SHA-256: b65d477f1db2b0b7482810b4dbb5b581561fccf89bd6101fc8faed0e3e87ef58
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 phishing or trojan payload. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains text related to 'review manual' and 'wkhtmltopdf', aligning with the heuristic that the PDF is a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=fe+electrical+and+computer+review+manual+2020 PDF link annotation
    • http://kixamugefuwa.22web.org/burger_king_breakfast_coupons_codes.pdfIn PDF document text
    • http://gajonedorebuko.mywebcommunity.org/jobovuditexip.pdfIn PDF document text
    • http://wugipesirexoxof.mygamesonline.org/92383620420.pdfIn PDF document text
    • http://xunajoza.22web.org/sample_detailed_lesson_plan_in_english.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/bearded_dragon_care_guide.pdfIn PDF document text
    • http://kogovokuriboti.22web.org/wegipojejasutetaxonobi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403959/normal_5ff4fca4c3a3b.pdfIn PDF document text
    • http://rekijiwowak.scienceontheweb.net/pdf_to_word_converter_offline_exe.pdfIn PDF document text
    • http://jefevivavifax.scienceontheweb.net/how_to_adjust_defiant_motion_sensor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480878/normal_5fe0f3117900d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fefirujo.rf.gd/five_functions_of_language.pdfIn PDF document text
    • http://firuxafuxu.rf.gd/excel_vba_worksheet_function.pdfIn PDF document text
    • http://fabemode.epizy.com/80915032548.pdfIn PDF document text
    • http://siwebojik.epizy.com/games4gains_answer_key.pdfIn PDF document text
    • http://rokosarod.rf.gd/pamugimifopeja.pdfIn PDF document text
    • http://padijajuvon.rf.gd/guide_to_using_excel_2013.pdfIn PDF document text
    • http://megisaduvivegi.epizy.com/wugaf.pdfIn PDF document text
    • http://jiwuboro.epizy.com/what_is_the_definition_of_reflective.pdfIn PDF document text
    • http://xejarejunap.rf.gd/u_bahn_berlin_netz.pdfIn PDF document text
    • http://pezatiwasab.epizy.com/50319268084.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_off00014647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14647 5420 bytes
SHA-256: 6716cebc2ca7e0e7bbb44c579630feba490ef23998f9f0d14c685f0062d8420c
font_01_sfnt_off000158b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B6 13932 bytes
SHA-256: b8c4615a2e3a310ac0b32411408db02ca9e2dec41dcac72f3002ac1d64b3e55a

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