Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d314a2995d4d4b3…

MALICIOUS

PDF

160.5 KB Created: 2021-01-07 22:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 2a3ace30092a552d4f65a1af184a5039 SHA-1: 9d1db53dd8f10d56e0de28b0f0b234f5ecd4ac37 SHA-256: 4d314a2995d4d4b325a3d712e50ef274d273b927d354b91832c17bb2c903bc83
134 Risk Score
Tags
free-cdn-ebook-manual-lure

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 and presents a deceptive download button. 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?utm_term=cdx+automotive+chapter+1+answer+key PDF link annotation
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/a62dc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367271/normal_5f9097327c782.pdfIn PDF document text
    • https://cdn.sqhk.co/lukedivibeb/vgdgggc/90750222896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416666/normal_5fa71a3a8285b.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/2760868.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/dhdhdjc/2790189789.pdfIn PDF document text
    • https://fewefemuge.weebly.com/uploads/1/3/4/3/134372507/5715920.pdfIn PDF document text
    • https://novafonofijufi.weebly.com/uploads/1/3/4/4/134480525/2525343.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403120/normal_5fc47bb3c6c6e.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/c8851aaa-f73d-4093-900a-45fc2f08ab4a/how_long_is_a_click_in_distance.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/kubuwire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57965ba1-6e5a-4544-ae8f-ad97e3b8be34/carrom_3d_game_online.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_off00021cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21CEE 5624 bytes
SHA-256: 9b52b77c00ac987223bbf8c24df8175d9c81276d2cc0c3ee08701f2eef223b8b
font_01_sfnt_off00023000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23000 15128 bytes
SHA-256: a2dc94f73afcb6680d485f4101e138a7bf2e0f8b19845611c6286998dff2ed79
font_02_sfnt_off00025f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F27 16132 bytes
SHA-256: 766dbd257529b303cfba4b78830c5c8401b3dde3c12a198e68d1ff417d41daa3

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