Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eba9650b6982151…

MALICIOUS

PDF

90.4 KB Created: 2021-03-18 23:23:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 555e51e632c3f7f5f577dba00ca54c43 SHA-1: 88163d8ea70fc929029698edc37998a7ae05fa3e SHA-256: 3eba9650b6982151d29264da795233af2a1926bae421446e2b0fc41a65ea6f9c
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a site that appears to be a lure for a worksheet answer key. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=density+worksheet+chemistry+answer+key PDF link annotation
    • http://autocredit.moscow/23905201541ic1zt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417669/normal_5fdaec079a10b.pdfIn PDF document text
    • http://lnstagramsupportinfo.com/35245937850a5eu.pdfIn PDF document text
    • http://scarcebook.com/blitzkrieg_2_manualky7ut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_604b6fc282018.pdfIn PDF document text
    • http://bazis-rostov.com/44323592792tvthb.pdfIn PDF document text
    • http://zipujesilan.22web.org/premabhishekam_songs_sen_songs.pdfIn PDF document text
    • http://pearhaidhr.fun/353763407805dxvk.pdfIn PDF document text
    • http://henrysavbr.site/how_to_memorize_2_look_ollhpf9v.pdfIn PDF document text
    • http://iciapp.xyz/acer_aspire_v5-122p-0643_battery7mtkb.pdfIn PDF document text
    • http://taxurofetizi.22web.org/riparian_zone_management_guidelines_tp148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_602fed08a4c04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/chrome_plugin_facebook_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52b33f3d-b107-4d84-af53-10e12980d349/best_fallout_4_mods_steam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7af9bfb-35bd-4cdd-9a5b-f45287e2e825/burugotulolaxaliwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e076a7d-c1be-4a61-a074-c7c23b1215e2/how_to_store_old_albums.pdfIn PDF document text
    • http://letulirabe.epizy.com/mabuz.pdfIn PDF document text
    • http://sonowodiguvab.epizy.com/54597974992.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/steam_stuck_on_starting.pdfIn PDF document text
    • http://sikejilewiz.epizy.com/fmla_certification_form_serious_health_condition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef68c451-75f5-47de-a676-1158eb28c9f1/4655138230.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_off00012449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12449 5264 bytes
SHA-256: 004ee1fe04043de0341b511bda317dc4b5ff0a8fca097fc5dad515414e5ceaf1
font_01_sfnt_off00013621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13621 11120 bytes
SHA-256: 7cb5ca2460799436c6a92d7a552cfea554f0dc3b7a86200d438d2f74c8dd772b

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