Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1515de5319f2b23…

MALICIOUS

PDF

89.2 KB Created: 2021-04-08 01:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b5f9dbf9ddc8146258f8474c8b952328 SHA-1: 1383be3798cc110a1b568a2709fab34e84b40540 SHA-256: d1515de5319f2b2354b39a9a3be344267d67949fa711562b452ae054b1008c8a
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fokemale.ru/strik?utm_term=how+to+hack+cricut+expression+2 PDF link annotation
    • http://zikewexer.scienceontheweb.net/dirozenisaladudog.pdfIn PDF document text
    • https://gojenegitoz.weebly.com/uploads/1/3/4/3/134387591/zujenav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419191/normal_5fc5cb6bda49f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408461/normal_60610e651d0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_6049356d22c7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414680/normal_5fcc88a586378.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/vjcQOn1/zulutiviroxabefik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496828/normal_600aac7e804b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_60503424248b6.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/egigigc/misuwidokikikigabage.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/xjfjajh/best_note_taking_app_android_s_pen.pdfIn PDF document text
    • https://cdn.sqhk.co/veladaxuzeba/dVw023E/lightroom_presets_download_free_mobile_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382412/normal_601b711c2b8e8.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/cjaiagf/anti_theft_alarm_for_motorcycle_philippines.pdfIn PDF document text
    • http://vekowen.getenjoyment.net/aldea_global_marshall_mcluhan.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/dagivutekojizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisetekotixob.myartsonline.com/moto_x_2nd_gen_battery_percentage.pdfIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/79279503956.pdfIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_e930ddbbe4464d04a23193fc0a937217.pdf?index=trueIn PDF document text
    • https://2b095ecd-e7a3-45cb-a122-23ed11f0a332.filesusr.com/ugd/613052_8caa6e3a47ba43959fe394c8618af32e.pdf?index=trueIn PDF document text
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_6ee12fc2a4134949b95352943411f520.pdf?index=trueIn PDF document text
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_3135ae8b02594f37a1fc5ae4a6405b79.pdf?index=trueIn PDF document text
    • https://901b9152-9067-49c5-8541-bb90c1a77dfa.filesusr.com/ugd/5d84e8_7dc9320fc2fd428bafbf2115c1988dce.pdf?index=trueIn PDF document text
    • http://gakajitaju.atwebpages.com/how_to_add_radio_button_in_wix.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_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 5308 bytes
SHA-256: 78158dc7492dace89a3b33f7080682cb04bb710f8f319157503d859806973845
font_01_sfnt_off00012d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6A 11728 bytes
SHA-256: aa48d0ad77ac8ad337a955c1b82c90eed5cd300a0544d3f3e95febc3cb933182