Malicious PDF — malware analysis report

Static analysis result for SHA-256 366aeaf284f52386…

MALICIOUS

PDF

75.9 KB Created: 2021-03-24 04:27:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bd854a7d1f2b1d22e7e2a1fe46d26b38 SHA-1: 8a9ba61a7519a3397ac06f33dee4717a97a1b01c SHA-256: 366aeaf284f523867b907ecc1fa8c93599aa4d9fae8c27df73380e3cf0a39542
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, such as 'https://nipisod.ru/wix?keyword=cata+herbalism+guide', likely serve to redirect users to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lead users to malicious content, consistent with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=cata+herbalism+guide PDF link annotation
    • http://vinuporabomod.iblogger.org/tojetetev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5fdd9eee26a8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_5fd217608ab5b.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/fhhDji6/the_creeps_film_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/Thj9fgh/star_fox_adventures_gamecube_iso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5fd1661bd2566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416331/normal_6003cfba316cc.pdfIn PDF document text
    • http://lopekojupapo.22web.org/34406872525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467027/normal_603934e4cb475.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/dSia0ma/japiluxigexu.pdfIn PDF document text
    • https://cdn.sqhk.co/fowifabibu/clqDhd4/gogo_live_twitter_2017.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/HhaSsif/89391071176.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gobusef.rf.gd/advantages_of_social_media_on_youth.pdfIn PDF document text
    • http://foweroboxufafuv.epizy.com/rugozadozebewil.pdfIn PDF document text
    • http://jivirazi.epizy.com/mubiziwarumowofegigulana.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/johan_galtung_teoria_del_conflicto_libro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74f477c2-5349-4143-a92d-edc3d9c43f18/what_is_the_term_for_a_government_with_unlimited_powers_over.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b8fe5d-b3c1-4fce-8b96-b17c83abde19/wubigitopusegojava.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f301698-49d7-41cd-94df-b3d6a5d61073/91945320563.pdfIn PDF document text
    • http://bimixurelulufob.rf.gd/abalone_game_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/vajefam/current_affairs_august_2019_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefa65a6-ab14-4a18-a925-0ec69bb7c19e/how_much_does_a_muffin_cost_at_dunkin_donuts.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_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 5284 bytes
SHA-256: fba4f7809c23ae0c5d86d3c5c72d28de8fcc2c2c189e4ed0f1e6895a63086d2c
font_01_sfnt_off0000ff26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF26 10284 bytes
SHA-256: d0bac55b6c899f779f0c87e74fd9ec65c5db1e1b28c31455ef6e5c738641f2b8