Malicious PDF — malware analysis report

Static analysis result for SHA-256 243139c12c6d6253…

MALICIOUS

PDF

78.0 KB Created: 2021-04-07 01:31:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3d92de5fb735ff8d8bcc84d16db18819 SHA-1: 2a2abac688d804704df81f1ad8083df41d87f9e4 SHA-256: 243139c12c6d6253140a11471dc1ab5bc25ce6e8176d292ce292abc6a9a77990
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the use of disposable hosting for SEO-related content, reinforcing the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=marriage+biodata+format+in+tamil+language+pdf PDF link annotation
    • http://bopugafuwu.scienceontheweb.net/liderazgo_creativo_alfonso_lopez_quintas.pdfIn PDF document text
    • https://wujupeduluruwuv.weebly.com/uploads/1/3/5/3/135316277/1642592.pdfIn PDF document text
    • https://tadinitalu.weebly.com/uploads/1/3/4/7/134744808/sifuni_fumoxidapago_refogukajo_rapar.pdfIn PDF document text
    • http://kiluzilaw.sportsontheweb.net/82372911686.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/rexifadovowedelu.pdfIn PDF document text
    • http://lugabev.mygamesonline.org/33241993324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kilarosine.atwebpages.com/free_convert_scanned_to_word_online.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_38c2ffe9c4eb43ed91cbe551b2b0f90b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a617637f-33a3-4b1e-b1a9-a6abee283fd0/21143366.pdfIn PDF document text
    • http://fuguzametekobo.myartsonline.com/dapigofetubetivunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d24316f4-cc4b-4357-b1ae-9ad34aabbee3/63169674532.pdfIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_e9a0de2c38044a129dba25611aa334ba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/zemazinoxugu.pdfIn PDF document text
    • http://gozudil.onlinewebshop.net/tepoposinumaxefa.pdfIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_ccff63d30bde45c9ad0850b977717f18.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifuto/the_age_of_adaline_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f652c84a-094c-4235-9a51-755bed92860a/wopapovifafudarixilikew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbced23-e8a3-44f2-a9fd-61206899b9ab/social_media_marketing_for_restaurants.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 5328 bytes
SHA-256: 001cfc014431a04fdc0d42bfbcaaeeae0f428be2226db9ecf5959c2a1ec2f6a9
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 11888 bytes
SHA-256: 0b83fdafdd732be19c5e035d28a6a02935fd19eb7860d93779ad749419a52287
font_02_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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