Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6448027f5cbecb…

MALICIOUS

PDF

72.0 KB Created: 2021-02-20 20:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bd69c7c4f4a4044d280faaf45957409b SHA-1: 51bd65ce636ecbaa88273d9687ad5a8c96b0721b SHA-256: bb6448027f5cbecbf136939057916a63e42035146b2e67195e37589190401505
126 Risk Score

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 0.9998

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://jottigo.ru/wix?keyword=rosario+de+liberacion+en+ingles PDF link annotation
    • http://ru-dev.xyz/hurrian_hymn_no_6_sheet_musicvq4j7.pdfIn PDF document text
    • http://construt.site/anno_2205_orbit_guidea6co0.pdfIn PDF document text
    • http://navalny.design/82945072282hjcn7.pdfIn PDF document text
    • http://sirosin.iblogger.org/circular_saw_blade_cutting_sheet_metal.pdfIn PDF document text
    • http://nonly.xyz/net_framework_tutorial_for_beginnersvt475.pdfIn PDF document text
    • http://bezugunafagomup.22web.org/abstract_background_designs_for_photoshop_free.pdfIn PDF document text
    • https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/rabimarulofixugezibo.pdfIn PDF document text
    • https://fogisavelubid.weebly.com/uploads/1/3/5/2/135299906/7e4c2e50f165.pdfIn PDF document text
    • http://xawowonulop.22web.org/rawumubanukedijijex.pdfIn PDF document text
    • https://xalojuxovev.weebly.com/uploads/1/3/0/7/130774978/vutiragul-luduralave.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/e44ba5ad74d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://deketinak.rf.gd/78774625400.pdfIn PDF document text
    • http://bidemuv.rf.gd/vopafadetovuvova.pdfIn PDF document text
    • http://fopuzotetowux.rf.gd/mojijoxim.pdfIn PDF document text
    • http://metorudadoz.rf.gd/repairing_sheetrock_ceiling.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7C 4960 bytes
SHA-256: c1e3960c3f2a3879ff13cce7bddd6a98d5ac8dab1379595352dd5d39de0f023f
font_01_sfnt_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 11024 bytes
SHA-256: 11db7dfdf7295db51ac38ac5a9ef3e9ba33c79f60e769d726187a4eb3d5314df
font_02_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3