Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8f638237379eeb…

MALICIOUS

PDF

77.4 KB Created: 2021-03-18 05:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ebe1b2e36190696f7d20d7086f225027 SHA-1: 2870834b2a800052d9b2f4f832de357186fd8a5b SHA-256: 0d8f638237379eeb9b90375ac8f89195d988d2baf3c5b4b5bcb99d9eba4a9296
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or SEO poisoning attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely to redirect users to phishing sites or download further malware.

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://xajibur.ru/award?keyword=book+bank+management+system+uml+diagrams+pdf PDF link annotation
    • http://posadukik.getenjoyment.net/92433521323.pdfIn PDF document text
    • http://wei-nmvc.com/minn_kota_trolling_motor_battery_power_centerx0bp3.pdfIn PDF document text
    • http://vuzisebepuda.iblogger.org/1979555686.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/zadevapujagi.pdfIn PDF document text
    • http://trokot-tonirovka.online/slimming_world_free_foods_2020yxaqm.pdfIn PDF document text
    • http://2022god.com/kufitogakiza50fy.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/will_there_be_a_sequel_to_death_note_anime.pdfIn PDF document text
    • http://freshremont.com/bet365_scores_apkqozgx.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/xabezegamadulurunix.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/jaundice_blood_test_report.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/57864671211.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/pofegiwoxudidefubowo.pdfIn PDF document text
    • http://beremoter.online/amoxicilina_250mg_ml_bula7cs9y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dosusixajamatef.rf.gd/28590627110.pdfIn PDF document text
    • http://penanaras.myartsonline.com/el_mundo_de_sofia.pdfIn PDF document text
    • http://bajipelorisu.rf.gd/57603152205.pdfIn PDF document text
    • http://novutizaxerujik.epizy.com/delemaxotatavogipojo.pdfIn PDF document text
    • http://sidajewaset.epizy.com/tijokufuxa.pdfIn PDF document text
    • http://lamumabazekutum.epizy.com/algonquin_park_trail_guide.pdfIn PDF document text
    • http://rigidafavubo.myartsonline.com/how_to_get_a_religious_exemption_for_vaccines_in_ct.pdfIn PDF document text
    • http://nevozabewovezo.epizy.com/94126066473.pdfIn PDF document text
    • http://tunijerizimajej.epizy.com/20392986694.pdfIn PDF document text
    • http://dogonuzema.epizy.com/wiwujet.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_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 5716 bytes
SHA-256: 2fca93028dfa368d98ed05d721fa8efe35fe8143f270b6ca913053f4fdc3a87e
font_01_sfnt_off000104d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D4 10392 bytes
SHA-256: 880be14747202bd375011caaf008b6f8bf363f8f516581e4a0580ba2c2eacc6e

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