Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5941d0f9a846039…

MALICIOUS

PDF

98.5 KB Created: 2021-05-26 13:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 659ba807c59e31d05c30d4e81c83fd57 SHA-1: dd59aaa0274c71b371a405e673f904a27ef66b8d SHA-256: b5941d0f9a84603912b34d923788710d3213ef65dde62c5b39ffe00a792a3173
156 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 0.9992

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 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.
  • 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://pelibifir.ru/strik?utm_term=unikey+4.0+8+final PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418783/normal_5fc9aa747156e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492897/normal_60373d188436d.pdfIn PDF document text
    • https://gulezawajure.weebly.com/uploads/1/3/1/8/131858287/5981442.pdfIn PDF document text
    • https://gudugobaxav.weebly.com/uploads/1/3/4/5/134500737/wedirabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415546/normal_6048e8ba5bdc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473419/normal_604794fc366dc.pdfIn PDF document text
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/f57c6ee.pdfIn PDF document text
    • https://gezumadugoviful.weebly.com/uploads/1/3/4/6/134611133/c9c10e9c7ae215.pdfIn PDF document text
    • https://xowasesulozuvuv.weebly.com/uploads/1/3/5/3/135347394/reson_wawasup_kosufejapa_delaxuzazonis.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a2d1ad2-d6a1-4521-938b-34d06bde4215/72986144546.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/bsava_manual_of_exotic_pets_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/railroad_tycoon_original.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/83072807007.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/quarterly_calendar_template_powerpoint.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/nitase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85a8cd5-ee86-4339-9ed8-d018cec0fbd6/zobopumunizebofokuwifa.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/madame_butterfly_boss_sekiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb57e41-83a1-4951-a838-eebb2acb3ab1/nikon_coolpix_l310_price_in_bangladesh.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/47929220426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/adee6e9b-f761-4590-83eb-ccc3d3ed9efa/43830438732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db7e339f-50c7-42e1-a068-79b8fd297f5a/10725876146.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://www.gnu.org/licenses/gpl.htmlIn 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
stream_003_off000105f5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x105F5 16320 bytes
SHA-256: 6b57ab733c65b27a0ac1679cfc086382c6247ab0f4979f4154167831b9013c92
font_00_sfnt_off0000f469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF469 5100 bytes
SHA-256: a1584e4aa4e1fab8bf1e91a480c64ecf1eb53cec14d913ac40599d499c7d533b
font_02_sfnt_off0001326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 22440 bytes
SHA-256: 53631c56e107181171e8bc3bcee68a5a694ad9962fc20dc9a27a36f231e97ab5
font_03_sfnt_off000164e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E5 16340 bytes
SHA-256: 8680b359cba86e2f6e9a78cf8c0f9e51b009e062d62f51157c34cd29f25a410b

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