Malicious PDF — malware analysis report

Static analysis result for SHA-256 409f0a1ce42d09a9…

MALICIOUS

PDF

82.8 KB Created: 2021-03-16 14:57:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8e9b4a18e64bb59a911d566a1e1933a8 SHA-1: 93cc2bbdc73045c8d26970ac8a664e2c7b180822 SHA-256: 409f0a1ce42d09a9ddcec06f41f7727019d5b1e6de5b22575c6f09d72e210e97
164 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 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 0.9996

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 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.
  • 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://vilenefex.ru/123?utm_term=bulleh+shah+books+pdf+free PDF link annotation
    • https://cdn.sqhk.co/bisadumiza/cMjdiih/libepafelomaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_6025d0e485d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_60508dedb365a.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/urAhggd/my_ufone_app_old_version_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/forexidof/gbjbBgc/85300180561.pdfIn PDF document text
    • https://sakirirolero.weebly.com/uploads/1/3/1/3/131383462/sarajole-xobafijoxebiso-soferapapeliz.pdfIn PDF document text
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/tijadu-pelabipo-letakafupip-nediwupinixubez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502236/normal_6008de9a783f9.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/hh221hJ/lisuzolipaxapox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486041/normal_6025ceebe212b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_601d12c771dc6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/dixaleko/denton_tx_police_accident_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/alice_cooper_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/the_price_of_gods_miracle_working_power_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/8027350238.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/18492186686.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/79006573884.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 5384 bytes
SHA-256: 9c77b8b54c44f23d7f65b638d491e411271145eb3c4681ef199105d848c73885
font_01_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 2900 bytes
SHA-256: 54c1b65ac537bf58d7f4afca6ec3977c3460b135055a7be37026993a43d468e8
font_02_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 10948 bytes
SHA-256: 67070abad210606235d3df8b171a61cf0e185dee0ba1f30c6a534bc8419d5913
font_03_sfnt_off00011c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7A 19468 bytes
SHA-256: 681ca4f4728735e9037f46ce274d5b78d22d9ed21a5fb364d978ae52b2085cfd

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