Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdd94cabd9603e3…

MALICIOUS

PDF

77.0 KB Created: 2021-03-16 06:59:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dd6474ef3a2852b7f77c94be75b4c708 SHA-1: df70c8f1588670dacd7874ec763e476b6facecdb SHA-256: 4cdd94cabd9603e3d6c749ad960961c35410433f3a3e74c1e4110bdb65b13c5f
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 0.9998

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://pelibifir.ru/123?utm_term=amos+and+josh+tutaonana+baadaye PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4418558/normal_5fe22ad973af4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501961/normal_603a4c949eed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_5fe810f257521.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/rapovegexofo.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/59410702399.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/23d8468a-ab0d-4c65-9c29-96adb7303f32/pifofebosipupimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8ba882-1e75-4734-b40f-2fc32016bc50/best_uchigatana_upgrade_dark_souls_3.pdfIn PDF document text
    • http://tesumavifan.epizy.com/p_adic_analysis_and_mathematical_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea68965b-0ab9-4bdb-a942-2898f4ecd2a3/what_are_some_non_examples_of_justice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/321ad4b8-3cb3-4bb0-b36f-a97ba750d763/dragon_ball_manga_full_color.pdfIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_b8a710634400461c91de1f964865c4db.pdf?index=trueIn PDF document text
    • http://fidotetunuxezi.epizy.com/wewowifiraxivoke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf05a47-0bf6-4062-b431-b7a66b7d5a00/xibifezubovifo.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_fe307e7db35246ed92dc3c3c4d1a13cf.pdf?index=trueIn PDF document text
    • http://vopodopo.rf.gd/game_bn_sng_cho_android_2019.pdfIn PDF document text
    • https://68420551-d949-41c4-975b-2ae86aa6d062.filesusr.com/ugd/09c3c7_f4c59240d705404fb882a8daf7ed70f0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3fe1a9-5cb5-44ae-8a4c-9c10c688a442/60674664334.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68aa9ee-1ebe-4707-9223-0f25387ed8d3/10596542658.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_off0000d365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD365 5244 bytes
SHA-256: e14ba23ae863e24386632d1d5bc42f590c2d6d120130edef9da044dba606de34
font_01_sfnt_off0000e520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 10660 bytes
SHA-256: 5b4134f76d9752876604e2b2d6544315f550a4d8e94c23396433df2280761b47
font_02_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 18776 bytes
SHA-256: 9e8409b995ac2b0bb76eb3eb8dd1c90fa55d1c1c8a40bb5daa08ca4080948d13