Malicious PDF — malware analysis report

Static analysis result for SHA-256 f627799312726cb5…

MALICIOUS

PDF

78.6 KB Created: 2021-03-17 18:52:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 772d663d3a2cc59301dd5fdd18261e04 SHA-1: 7c6f79af19dbb617b470ab5dc57ca912aaec01c3 SHA-256: f627799312726cb56cc6445e79599e95046bbf6edbb9ac4bfcbca02df7267736
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent link pointing to 'https://zajinet.ru/strik?utm_term=headache+when+having+sex'. This URL, combined with the heuristic 'PDF_SEO_LINK_FARM' indicating a large number of external links, suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=headache+when+having+sex
    • https://cdn-cms.f-static.net/uploads/4475564/normal_5fd67c6dd910f.pdf
    • https://cdn.sqhk.co/korulifesewa/hidhhhi/hide._io_play_now.pdf
    • http://com-connexion.xyz/guess_the_emoji_house_and_bridej9h81.pdf
    • https://cdn.sqhk.co/supopareso/ihw6G6L/spider_man_venom_marvel.pdf
    • http://fruit-italy.space/fotozozozozn4hz0.pdf
    • https://cdn.sqhk.co/labojime/fHgdK0D/road_trip_travel_planning_app.pdf
    • http://uscarinsurance.info/divinity_original_sin_2_walkthrough_deutschdcok2.pdf
    • http://homiak.fun/four_corners_2_workbook_answer_keyc0e75.pdf
    • http://life-news.tech/how_do_you_start_a_paragraph_in_an_essayxtaiz.pdf
    • https://cdn.sqhk.co/xitilesuxiw/lw4ysjd/zavemesupofetejatob.pdf
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fe5030c78481.pdf
    • http://ru-1.casa/52515498333oobfl.pdf
    • http://topcreditmonitoring.info/fesexupadilaxakinogitakl9ou2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9dc09adc-8ba6-4976-8311-9663c0298e83/koxupamagabujixomepurig.pdf
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_9ed32f4afa4e466da173604ebfec9af0.pdf?index=true
    • https://c2c662fa-00ac-4c69-bf5d-04da7d6c99e2.filesusr.com/ugd/9b33c5_c73ceb7b7b0e4eb3a237923b69b07594.pdf?index=true
    • https://uploads.strikinglycdn.com/files/886b1b18-9283-44bc-bf26-e0f8b57a934d/padofexenuvegidazisezir.pdf
    • https://uploads.strikinglycdn.com/files/5329cdbb-2b44-4987-b21a-1ee62ddee30b/65443373950.pdf
    • https://uploads.strikinglycdn.com/files/9ac697df-0a7e-44cd-bc2c-a595a4505fff/91426235138.pdf
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_3527d11a36b641ac8d39749661e4c86a.pdf?index=true
    • https://9534cc33-30dc-483d-bed2-8d5691710d48.filesusr.com/ugd/3835dd_1fc165d1349e47699068b7a7641893ac.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e6.bin
df9359405a76b4d1c24664c4c65180c249b0f99396c10880fc5cddbe619c4371		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 5252 bytes
font_01_sfnt_off000108e0.bin
44ed411cfd45616f30707e18b4892d300b22e0789a151443f60b848da08418d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108E0 10704 bytes

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