Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fa91625f1288ba…

MALICIOUS

PDF

81.8 KB Created: 2021-06-09 19:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 6d8561d3d393d28b82efadfdac7b7d23 SHA-1: 3f3d5c634e6f022614cd57a5e2be6231d4e4f62e SHA-256: 17fa91625f1288ba3a758bd2bcf9a5e375b8756d6f115cfea18e647737190e87
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

This PDF document was flagged as malicious by multiple heuristics and a machine learning classifier. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. Crucially, a 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique to trick users into running malicious code, potentially downloading a second-stage payload from one of the embedded URLs.

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://laborke.ru/pbw?utm_term=sci+usb2serial+win7+64bit+driver PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496151/normal_601a02d28975c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376625/normal_60294160c64c3.pdfIn PDF document text
    • https://sufusazowuk.weebly.com/uploads/1/3/4/3/134311692/puvosibinal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_6046f29d99f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368245/normal_5fdb9c39a9c1b.pdfIn PDF document text
    • https://nevonanopovew.weebly.com/uploads/1/3/4/3/134335048/mopeku.pdfIn PDF document text
    • https://favasebuwakule.weebly.com/uploads/1/3/4/3/134328846/bofosa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477916/normal_5fe18fe1d341c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450721/normal_603c78bd1acc4.pdfIn PDF document text
    • https://pobogovowot.weebly.com/uploads/1/3/5/3/135323888/bavewuxuti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_60374620137d6.pdfIn PDF document text
    • https://zugasemoz.weebly.com/uploads/1/3/4/5/134593751/napulewarozasabop.pdfIn PDF document text
    • https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/jiwewilefoku.pdfIn 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/d9d5560f-d62e-497b-8fd5-b7daa62d0621/wuwewalojesibit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14628f6d-fdbf-4281-9014-57503389b5b7/baofeng_uv_5ra_programming_software_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE81 5780 bytes
SHA-256: 2472207a3f663f6130da87a8a945864218ce18318236f30d8828b150a3ebef13
font_01_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 16752 bytes
SHA-256: c7807fafb54ed811d41df7e47de80f2c6dead9e1275f3c866c8f997161274760
font_02_sfnt_off00012531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12531 16096 bytes
SHA-256: 292b67320f20e7e38814323bff47001ccb55b5eebb397aea8a254f3e91f57b87

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