Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efbc9ce9b93abcb…

MALICIOUS

PDF

85.0 KB Created: 2021-03-24 01:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 070a4760930a82f8117659c4c21f93a1 SHA-1: 305abede86af7fa38ed51746bb2d60962ec140e3 SHA-256: 6efbc9ce9b93abcb2c6e79fa084c2afae03e17190384c897b83431fb69e11b9f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of seemingly benign ones. The presence of external URIs suggests an attempt to redirect the user to potentially harmful content.

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://dugedepap.ru/award?keyword=muscoli+agonisti+e+antagonisti+pdf PDF link annotation
    • http://gojavodevagajuw.mygamesonline.org/96608598721.pdfIn PDF document text
    • http://lenulari.mypressonline.com/35145683213.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/sevidajobixa.pdfIn PDF document text
    • http://gomivewikikuwu.22web.org/zuwuwikililejozenimo.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/bhagavad_gita_tamil.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/samsung_galaxy_s9_plus_size.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_6038c626dbe7c.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/latojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_60547a0b7ced7.pdfIn PDF document text
    • http://roserubusigiwij.mywebcommunity.org/jersey_city_public_schools_pay_schedule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tibugesifavetel.epizy.com/xarulapapanozizosenune.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/formatting_excel_sheets_in_r.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/lexus_rx_350l_2020_review.pdfIn PDF document text
    • http://tibibexubedumu.rf.gd/bim_360_location.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/98654610152.pdfIn PDF document text
    • http://woporebokut.rf.gd/celebrity_voice_changer_premium_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39f8ad1-fde1-4a5d-8b12-ecc8ccfeba37/how_did_taylor_swift_get_her_start_in_the_music_business.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d1716e-4289-4817-a347-58cf4e0b0f62/41694585359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63c4e106-a853-4f1d-97a1-d6a2e079ac46/36210523971.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/free_bootstrap_ecommerce_admin_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e626b401-b4e5-4ad7-9466-a45e1f6ce452/python_auto_start_programming.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_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 5232 bytes
SHA-256: ce0b99ef0170e91b5fc1915d107803021deeb8756fb8203eed792e79d28b0a9c
font_01_sfnt_off00012236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12236 10796 bytes
SHA-256: 3cd50a84459d78908f0a064cf225d4c6ea9b5383ce7518867f313de9940cd2c6

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