Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa366b54300e1c7…

MALICIOUS

PDF

75.0 KB Created: 2021-04-04 21:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6e8046d7dc72ec082d9d15aef2cff943 SHA-1: c6304f5cd4369bb9ac642efe34e2c6fc56893314 SHA-256: efa366b54300e1c7d7a73dfbe3039966ae67b3e05851035a9bc57078c3dd9f40
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 embedded URLs, many of which point to disposable hosting or potentially malicious domains, suggesting an attempt to redirect users to harmful content. The document body, though heavily obfuscated, appears to be a lure related to common search queries, a tactic often used in phishing campaigns.

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://zajinet.ru/aws?utm_term=how+do+i+turn+off+my+sprinkler+system+for+winter PDF link annotation
    • http://ganedoxumizaj.sportsontheweb.net/sentencia_altsasu.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/qgfja7v/world_war_z_game_review_metacritic.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/gje5gen/45846103228.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/JxAhjdu/weragezakezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477916/normal_6062764c42cfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415739/normal_60521d9760884.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/do_they_still_make_kerosene_heaters.pdfIn PDF document text
    • http://xoxapepagaxon.mypressonline.com/zunibetalewumiredu.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/nozusalekupoluwabug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481422/normal_5fd222cc3a6c6.pdfIn PDF document text
    • http://vixitatevejiwo.getenjoyment.net/tuzivafipurokilawegeruvu.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/liverirubus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/905b9f86-a896-4ff0-a2eb-de20b9228099/how_to_reset_a_samsung_soundbar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3772fc65-2a5c-4a83-92d8-0d9a544be423/kewonepewifezenesefopu.pdfIn PDF document text
    • http://pujumek.myartsonline.com/data_analysis_and_interpretation_in_qualitative_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33a28e3b-37f6-4348-b23e-73000182a3c0/hp_7525_photosmart_printer.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_a279df32b2554c5fb3b40cb1891ff455.pdf?index=trueIn PDF document text
    • https://c207dc97-0cc9-441e-8caf-a702c1639d46.filesusr.com/ugd/36abe8_6057856c99b34d17ae39c521742ef7b7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/266aa3dd-c7c6-48b0-8922-9f69e0843dd3/ti_nspire_student_software.pdfIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_071992dc00b546368adcd68e169517af.pdf?index=trueIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_b59f23b459bd4f4d9cfd0c7cc736a517.pdf?index=trueIn PDF document text
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_4a1bd7ff038f4fa9a55c318a153cf5d4.pdf?index=trueIn 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_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 5196 bytes
SHA-256: 1860c20cf36c39229586d6f2500440dfc7e41d33c83b612d5968ab59159fe08e
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 10756 bytes
SHA-256: d59732c868d3dcda4de8294e618c7be7c75afa173fce65b3a5b8ab6d2e994e6a