Malicious PDF — malware analysis report

Static analysis result for SHA-256 f340bb23bacda71f…

MALICIOUS

PDF

80.5 KB Created: 2021-03-03 00:58:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a7abef6ce953394dd0784d5d600f0a6 SHA-1: f457ac6f11c04959aa8fa63c1527c1a7d89bec94 SHA-256: f340bb23bacda71fb32c9588624ee8fc3d609f10d300eb900ec99ad39a6e1b6e
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. It contains numerous external URIs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing or malware download sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using many links on disposable hosting to obscure the true malicious intent.

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://kuzutuzo.ru/wix?keyword=hack+gu+last+recode+vol+2+guide PDF link annotation
    • http://tonagruz.ru/25269053845toqe2.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/wegirevikibugo.pdfIn PDF document text
    • http://hyipinvest.site/windows_10_su_netbook_acer_aspire_one_ao7561rd18.pdfIn PDF document text
    • https://cdn.sqhk.co/lapefuxolu/hggibhi/poririlanusoxiranigoriji.pdfIn PDF document text
    • http://pearhaidhr.fun/ragnarok_eternal_love_alchemist_homunculus_guide8uvy6.pdfIn PDF document text
    • http://clientbluebadge.com/hunchback_of_notre_dame_musical_sheet_musicffacn.pdfIn PDF document text
    • http://health-top.ru/40300703255nqmbt.pdfIn PDF document text
    • http://tesocoin.online/61776616017ojcpr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450501/normal_60359e85069d3.pdfIn PDF document text
    • http://italia-doc.space/uworld_step_2_ck_2019_free_download74787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485809/normal_5fd9cd3d6f20c.pdfIn PDF document text
    • http://load-bcp.com/best_dork_diaries_book4ae3x.pdfIn PDF document text
    • http://kinorio5.xyz/does_whirlpool_washing_machine_have_lint_filternjdm2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabenejajoko.myartsonline.com/operations_research_analyst_education_needed.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/gobevuvomodusuzofifiredux.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/wumuro.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/pathophysiology_of_heart_disease_7th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/internet_speed_monitor_apk.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_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 5324 bytes
SHA-256: 3fdb501fe269667340f83fbb86c4132bad4a0d396fce33ed98b29f00cc39ca2a
font_01_sfnt_off000110cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CC 10476 bytes
SHA-256: 6f810f45fdc615c90498ae0b09f8b27bb6b147ff62503a43d70deaecfe912901

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