Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a3d6e61bd55ee8…

MALICIOUS

PDF

83.2 KB Created: 2021-03-31 07:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 78e0c2dc74d9ee80c2695dabc96d933f SHA-1: 8f753dcce15e9e352f33c51339e6c711c14deedc SHA-256: 99a3d6e61bd55ee8fee7f172e5686a4ce14303b3893b76bc0066accd406b57de
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://maypoin.ru/strik?utm_term=what+does+no+te+metas+conmigo+mean+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406208/normal_6031f245081c1.pdfIn PDF document text
    • https://xokizaneg.weebly.com/uploads/1/3/4/8/134886830/6223683.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/ja0jcYD/feeling_alone_status_for_whatsapp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451566/normal_5fe53ab2f1082.pdfIn PDF document text
    • https://cdn.sqhk.co/kidatufo/jjhfji3/my_cloud_storage_2tb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392854/normal_603914457a799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410727/normal_6001a969ec4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_604a2b9c1b5a0.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/3945787.pdfIn PDF document text
    • http://lalabomujulimof.mywebcommunity.org/99553294026.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/vigonagawipes.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385028/normal_5ffc4caa4b3fc.pdfIn PDF document text
    • https://lovaxases.weebly.com/uploads/1/3/4/6/134685664/1622389.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_6025743d8391b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xuzakob/capital_markets_day_2020_aegon.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/68526808896.pdfIn PDF document text
    • http://dilutibu.onlinewebshop.net/acupressure_point_chart.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/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
font_00_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 6804 bytes
SHA-256: 28b39597e1b5a207952c2ded4d6a2b70a449ccc08cce7f12a798387c99f032c3
font_01_sfnt_off0000ecfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFD 5272 bytes
SHA-256: 54e1b2da8f41221ad37c01bb35e4a8758313ce2458e221ced1a9552ba699d0ad
font_02_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 12424 bytes
SHA-256: ec2eddda272ef681e798e427ca27ba435a6ab6191c65a255d9dbbfd64be0524b
font_03_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 16492 bytes
SHA-256: ee139d6c6a2d6ea82b054f9fc882acb3aea8f775be819f50524a2f9d44cc468b

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