Malicious PDF — malware analysis report

Static analysis result for SHA-256 c457372ad0285ea1…

MALICIOUS

PDF

78.0 KB Created: 2021-04-02 07:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5629184b75a1b6693fb021d21184ddfc SHA-1: c45626565ed6bd2f4b391a83146e4744502338e0 SHA-256: c457372ad0285ea1fd214ff0889c08a7c1ae68084f765d6ac782c8736a71e2d9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/award?keyword=lexham+hebrew+english+interlinear+bible+pdf PDF link annotation
    • http://ozalupa.space/xabixidobamarupirusesabyva4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410695/normal_603b74a774079.pdfIn PDF document text
    • http://beritox.medianewsonline.com/61632978177.pdfIn PDF document text
    • http://ersoil.fun/bidenajagelazebexep5gysx.pdfIn PDF document text
    • http://bostpolamos.site/juz_30lwgez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_606480efb1134.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_6063a9b77aecb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451971/normal_5feb338f29aa6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c9254e9e-0e71-498a-8384-ab4c929b52b4.filesusr.com/ugd/0699ff_01d8f8df2e934d6eb11887c4c20ae82c.pdf?index=trueIn PDF document text
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_0ae099d7399b4dc39f86e90ab6a191e4.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_058730da4f474335a9084f568cca8598.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_fb8434aac50b4be1b0c5d9801da70153.pdf?index=trueIn PDF document text
    • http://vebusatoro.atwebpages.com/dujoloramixagamijedapemi.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_89a68c6c089e4b65b7456b5b8978ae35.pdf?index=trueIn PDF document text
    • http://vefulodivigajeg.epizy.com/42503718000.pdfIn PDF document text
    • http://vejebuta.rf.gd/rta_l_s_test_questions_and_answers.pdfIn PDF document text
    • https://ff4d9611-e7ea-45f2-85d3-f0b464ef817f.filesusr.com/ugd/48f461_78893ac817084d9a9a6bc4b693e33cd3.pdf?index=trueIn 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_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 5696 bytes
SHA-256: 2b79ade303b9368a82ef5ded235fb894ef90f845573ea4af680626e2598d33e6
font_01_sfnt_off0001055d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055D 11064 bytes
SHA-256: 488b9589cc0bbdfd5dde0dca9623e652db67c1f1400305b4354aa19db071a494

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