Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8899c1cc19b2ee4…

MALICIOUS

PDF

77.2 KB Created: 2021-05-30 16:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 29c8632cbfb55a43967323892c1a8731 SHA-1: 51d96e8d938b87e8ebba19656a7fcca2bf78ac2c SHA-256: a8899c1cc19b2ee4bc4a9c81a05c6b41b64d0e9eefca44d33ec8912154738ba1
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-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.
  • 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://botokaw.ru/strik?utm_term=starting+out+with+visual+c%2523+5th+edition+student+sample+programs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445129/normal_5fd5f392e6585.pdfIn PDF document text
    • https://zexivavu.weebly.com/uploads/1/3/4/8/134872555/biregelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486034/normal_6002e7d69e30d.pdfIn PDF document text
    • https://fekakekofum.weebly.com/uploads/1/3/4/6/134656499/xelenenekobode_gogenoxubel_nugabafa.pdfIn PDF document text
    • https://putepinezuvoko.weebly.com/uploads/1/3/1/8/131856998/9761561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379606/normal_602c68cbe82ec.pdfIn PDF document text
    • https://kakabotosor.weebly.com/uploads/1/3/0/7/130775724/bewawuxewivazerep.pdfIn PDF document text
    • https://pemugaladesav.weebly.com/uploads/1/3/5/3/135307247/vefamav.pdfIn PDF document text
    • https://xakajebegufawev.weebly.com/uploads/1/3/4/7/134729098/zixebozar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_5fdc37332e2d7.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/557839123b5167.pdfIn PDF document text
    • https://rugepokowefi.weebly.com/uploads/1/3/5/2/135294276/56b670393e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450034/normal_6033208384757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449399/normal_60625abc379c0.pdfIn PDF document text
    • https://nakilogizo.weebly.com/uploads/1/3/4/3/134363069/rigiji.pdfIn PDF document text
    • https://lutividagij.weebly.com/uploads/1/3/4/8/134896544/zovatufejivet_wikomiba_solesajapago.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 5316 bytes
SHA-256: fa5b081d515a107423d13c4b3d8e475b3df78875c5ee6ad97693fdc2da59d1d5
font_01_sfnt_off0000e744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE744 11184 bytes
SHA-256: debdc42c7615847ed830150c4368956cf13bcfde40d2ca75fb249d1868b4c851
font_02_sfnt_off00010c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C67 17436 bytes
SHA-256: 5b480ccf1ba5b3d7726cff0b7fd562276ca0ee5aa67486a8b1da4fc4a5aeb7e1

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