Malicious PDF — malware analysis report

Static analysis result for SHA-256 db76546035f49445…

MALICIOUS

PDF

89.7 KB Created: 2021-06-10 05:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4f464cf1bb41b936ea0137dc1fa92fa8 SHA-1: b84e262ecde6b8751de3c89e0287dfad928036eb SHA-256: db76546035f49445d2775b1ce4480665cfc8ed3ab0864941e321884dee8e604a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. 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 0.9994

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://allytemp.ru/pbw?utm_term=windows+10+ad+hoc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480893/normal_604629ae18ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_603816b7e450a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_60c0aa8a6ad45.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368500/normal_60b78a3f8a876.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491398/normal_601835a454785.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497687/normal_6032327460872.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_604f6d12ae706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426960/normal_5fd62b87d692a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530868/normal_5fe7e2fed2f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366014/normal_6015bdb748500.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374199/normal_5fceafb7d8e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_602868e78b199.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/8224c1e2-d0d1-43fa-bf9d-58ab1faf9a5c/marugolor.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/w/file/fetch/144527691/how_to_watch_2_twitch_streams_at_once_on_mobile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15849297-240e-440c-950f-7aa5f013f3f0/lasko_stand_fan_costco.pdfIn PDF document text
    • http://ruzudateteb.pbworks.com/f/silekapafogipimubodezewev.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/nolanaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0d539d-4a9b-4c03-8ff5-5de0832cc50b/xibuzulom.pdfIn PDF document text
    • http://fifafar.pbworks.com/w/file/fetch/144865014/27377272503.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d3e22e-c369-4325-8c12-f3b6b62cfc3f/how_to_get_access_code_for_pearson_books.pdfIn PDF document text
    • http://dekokos.pbworks.com/f/80883574407.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_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 4736 bytes
SHA-256: 6c0367c8b7a3a2cef65db9b10ad775b237082ef4f526e94ffceb0ba40926db6f
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 5200 bytes
SHA-256: bb023439ffb48488b26a9a7d9b6fcd30fb3e6e02aeb3f18b3a97cc84ff223349
font_02_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 20988 bytes
SHA-256: d3dd696070f3c6b99c1a559ebbc93e87aa8ee68d0bfdc6b63525a325af654db1
font_03_sfnt_off000140d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D0 16528 bytes
SHA-256: 428c4e5d1a931006f7a10736551172e43bcf9b71cb6f1e8e3d3ca2bf340a4d85