Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1c7498f99b81cd…

MALICIOUS

PDF

69.3 KB Created: 2021-02-25 13:15:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 22947926be4c4c1355738da5f91ccb4b SHA-1: bac36f1195a1f7107291c6176c1124fd51daf7f3 SHA-256: 2b1c7498f99b81cd6da87076dc0eab3947a1dc325333f6844e81585a0c17d589
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. Numerous external URIs were extracted, many pointing to disposable hosting and forming a link farm, indicating a likely attempt to redirect users to malicious sites. The document body contains garbled text and metadata, suggesting it is not intended for direct user consumption but rather as a container for malicious links.

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://maypoin.ru/wix?keyword=answer+lyrics+phantogram PDF link annotation
    • https://cdn.sqhk.co/konafomaz/hfhfieU/sky_force_world_war_1.pdfIn PDF document text
    • http://mexicotop.xyz/cabal_online_guide_2018ms86j.pdfIn PDF document text
    • http://legejuwarowu.22web.org/gelong_thubten_guided_meditation.pdfIn PDF document text
    • http://dress-russia.ru/mojitatifumodeza9f5zi.pdfIn PDF document text
    • http://beststudent.fun/chalice_dungeon_guide_imgurj3hsi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428043/normal_5fe936af28cae.pdfIn PDF document text
    • http://sosed.market/avaya_ip_office_500v2_control_unitfa3h3.pdfIn PDF document text
    • http://vir-tus.com/24345159849fhdd7.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/XhfgdhF/gods_of_rome_game_download_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/rigowodikot/djaQt4b/pac-_man_world_2_gba_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370078/normal_602451f18fe46.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
    • https://s3.amazonaws.com/jeduzizonox/my_autograph_kannada_all_songs.pdfIn PDF document text
    • http://patesosiw.epizy.com/child_care_menu_guidelines_nsw.pdfIn PDF document text
    • http://dosidojabar.epizy.com/guide_michelin_restaurant_chaumont_sur_loire.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/lirejiselefizoditojima.pdfIn PDF document text
    • http://sawubomom.epizy.com/answering_service_jobs_toronto.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/xeraraf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC584 5316 bytes
SHA-256: b80802119acafb019948178d31c3358cbda4a301d8c813ec78b4d8540ca535c3
font_01_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 10272 bytes
SHA-256: ff0824410d76bdd951e313f25d83ab00b38f7bccd8d0b1a0d92c606ac2eae2f5
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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