Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aecfc17427b5c06…

MALICIOUS

PDF

75.9 KB Created: 2021-04-18 10:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 88d3d9ff67a2b79f89038059a8eeed46 SHA-1: 562d6955c42f084cb311282e826dca91a7c37683 SHA-256: 7aecfc17427b5c06efd26c5a1df8b85c67c9d078f7cf6c9d08d026c60160c4e4
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. The document body contains a seemingly innocuous search query, 'What is the new girl scout cookie for 2020', which is likely a lure to encourage users to interact with embedded links. Several external URIs were extracted, with https://zajinet.ru/strik?utm_term=what+is+the+new+girl+scout+cookie+for+2020 being a primary indicator of a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://zajinet.ru/strik?utm_term=what+is+the+new+girl+scout+cookie+for+2020 PDF link annotation
    • https://cdn.sqhk.co/lopumilekana/hcoii7p/hp_smart_app_for_chromebook.pdfIn PDF document text
    • https://cdn.sqhk.co/liminekaj/ezM2hjF/anti_stress_ball_funny.pdfIn PDF document text
    • http://pumujavebedopa.iblogger.org/ctv_news_reporters_edmonton.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/ahcOsjc/kingdom_hearts_dream_drop_distance_wiki_guide.pdfIn PDF document text
    • http://vutuduzuzawejuj.iblogger.org/how_to_write_a_diagnostic_assessment.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuzijix/7Doihhb/7202445210.pdfIn PDF document text
    • https://cdn.sqhk.co/xagogowan/hfCzUd0/bataan_weather_report.pdfIn PDF document text
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/04033c9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_6050457178ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461525/normal_605d986fb03f6.pdfIn PDF document text
    • https://sewizafisebe.weebly.com/uploads/1/3/1/4/131437566/pewonukeraduda-gupekifapanidof.pdfIn PDF document text
    • https://cdn.sqhk.co/vopupevomate/jfgehp0/supokirakemopuwizunev.pdfIn PDF document text
    • https://cdn.sqhk.co/wimiwupo/juW7ueb/rikoridobujanowawigi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezupipul.rf.gd/a_noite_dos_mortos_vivos_livro.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_4f03ed6404a944709c8524b5f9d19453.pdf?index=trueIn PDF document text
    • http://melamefi.rf.gd/budismo_tibetano_alan_wallace.pdfIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_d989f832e03747abbff46ad5366a203e.pdf?index=trueIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_cef8bb39cb124ff1a88e122c1ad10b36.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_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 5588 bytes
SHA-256: 4684db396249d844dac562eef4660d430c494847565d9147e7b5e97af7596fd7
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 11692 bytes
SHA-256: 0ef74b9ae9ed41d31bdb88093e9d7d69342b65591ff6e9de2f0995be255fe397

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