Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecac8f42b460dfcd…

MALICIOUS

PDF

81.5 KB Created: 2021-03-17 15:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d1519625b6046ffdca346eb47b9676d SHA-1: 9f3a3e222af63555efa6b132da6a04f10191d375 SHA-256: ecac8f42b460dfcd1e87b7cb89034009e48bdd007231ce1897d98a44882cb1e1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/wix?keyword=free+activation+code+cleanmymac+3
    • https://static.s123-cdn-static.com/uploads/4499629/normal_5fec4351c5124.pdf
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5ffbbc51ede4c.pdf
    • http://ueuniti.website/64375222898jcv22.pdf
    • http://duvevonisupobav.22web.org/90512355613.pdf
    • http://limecash.xyz/petta_audio_song_mass_tamilangukoe.pdf
    • https://cdn-cms.f-static.net/uploads/4376375/normal_6042f171317a9.pdf
    • http://gobegoxox.22web.org/brother_hl_3170cdw_drum_slide_green_tab.pdf
    • https://cdn-cms.f-static.net/uploads/4414172/normal_60248f186f2af.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_36ba04d062614c6c981e6b30c3c28e06.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_9ba20cf014464fee9bf7274de60b6409.pdf?index=true
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_2aaad0bfaa374301b5317ab8fd0d2fa3.pdf?index=true
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_1f8c7c750bed4027a6813eef54e9dd63.pdf?index=true
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_c955bef0c3464a968b1ce9c59b741a50.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eb63c675-231d-4b3d-b0fb-35acaf827b2a/reflexive_and_intensive_pronouns_quiz_with_answers.pdf
    • http://kuwajakuxoj.epizy.com/91389135917.pdf
    • https://uploads.strikinglycdn.com/files/15fe7ca1-057a-42a5-8ddb-05f3e7bc7174/indian_business_law_books.pdf
    • https://04a9e765-cf69-4035-9b9a-998d8fb4e692.filesusr.com/ugd/8c5016_56a20666f91344788231b88b46d8c7a4.pdf?index=true
    • http://gapibixofezutef.epizy.com/kapumurax.pdf
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_7a78c448a75244dbaa03195d405dfbfa.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_off0001018d.bin
6b69775e31bf0973c753921b9e2b28f08e12002b2d7063a8d7b527a1bc0585ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1018D 5188 bytes
font_01_sfnt_off00011333.bin
eef455677e975ba4d07aae1fccc39d7fc8e065af9c3570b2083c7d5af1e8df52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11333 11008 bytes

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