Malicious PDF — malware analysis report

Static analysis result for SHA-256 72041e51c7c4ece7…

MALICIOUS

PDF

85.7 KB Created: 2021-03-18 20:18:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 936b72f44986edb797c5b2a9528d3335 SHA-1: f373b82345f4bc25a54f3c4e975d5a27362686a9 SHA-256: 72041e51c7c4ece73e838ef5d5d1353f019ae2b8726fb2106f7b08bad9dbecc9
186 Risk Score

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 0.9955

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://zajinet.ru/123?utm_term=canterbury+regular+font+free PDF link annotation
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/bodezikuwurimufiri.pdfIn PDF document text
    • https://nupiwezorebor.weebly.com/uploads/1/3/4/7/134715096/tesenepusapuji.pdfIn PDF document text
    • https://subarijarasojud.weebly.com/uploads/1/3/4/3/134332778/cbcaaaceef31c.pdfIn PDF document text
    • https://sawasorepe.weebly.com/uploads/1/3/0/7/130739445/xatisevoge.pdfIn PDF document text
    • https://cdn.sqhk.co/zudoputasafe/gdAiijd/vegutajuwofojezozowejo.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/sociology_101_lecture_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/BIT8iai/26835199611.pdfIn PDF document text
    • https://zatagigozot.weebly.com/uploads/1/3/0/7/130775916/9cf3ebfce.pdfIn PDF document text
    • http://vopagokiniki.mypressonline.com/74911970682.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/LiihcVf/easynow_business_management_apps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494893/normal_5fcf424a16206.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/kejahfv/party_horn_sound_effect_dj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377925/normal_601a4d365e68e.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/85517393992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451929/normal_5feb0694358bd.pdfIn PDF document text
    • https://zikepasut.weebly.com/uploads/1/3/4/1/134108801/0d1ad379577.pdfIn PDF document text
    • https://vevotudoxis.weebly.com/uploads/1/3/5/3/135313682/kirajidera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_60105bc766463.pdfIn PDF document text
    • http://wofurasosezisax.mywebcommunity.org/performance_evaluation_form_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478968/normal_5ffd6f02821ba.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/hwha2if/lemirosegesalirurokax.pdfIn PDF document text
    • http://zutolewe.mywebcommunity.org/fefovosiso.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/a2b2e61a-13cf-4618-8975-a2bc3fb03366/black_and_decker_20_volt_battery_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a824b268-e52e-4a49-82e9-23c46466e05e/45140126602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f7bd1f-fea7-4f17-a8fc-beee2bf03ad3/gebojub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1985c4a-2b8f-476f-b35a-24aee78f23b6/xuzowogawapejol.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_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 4904 bytes
SHA-256: b9ab0fd1c75fc1bccd73c78600b088bc1b37def46f4fba688180f56c9e96d5d4
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 3420 bytes
SHA-256: 53575dda6ac20f17b73e8777cccd1ed2c1353327d405dbaf41fdb8bd6ccc3e7b
font_02_sfnt_off000105e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E7 25708 bytes
SHA-256: 1777c5e4e042483eab1edcf082bdb5f219f8162391c9ad10a5d5981230668516