Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb93aa0c168b1ab4…

MALICIOUS

PDF

75.6 KB Created: 2021-03-30 21:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 38fb2ae71df4515c0fa071604f7758d9 SHA-1: c2169f1edef59adac90e155fadcfbd2b44be149f SHA-256: fb93aa0c168b1ab447f8a66003c1fbf1ae5a42d53db4e5f79564a8850fd21d60
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains keywords related to study guides, indicating a lure to trick users into visiting these malicious sites.

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://kuzutuzo.ru/award?keyword=ccht+exam+secrets+study+guide+pdf PDF link annotation
    • http://tdsevsvet.ru/maths_worksheets_for_grade_1_shapesc3dru.pdfIn PDF document text
    • http://vas-rem.ru/equivalencia_neumaticos_pulgadas_a_milimetroszx14m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402721/normal_602ea7a2ac239.pdfIn PDF document text
    • https://cdn.sqhk.co/lobinazema/i65higc/short_funny_animation_video_download.pdfIn PDF document text
    • http://babysampler.com/what_is_the_storyline_of_the_nutcracker_balleth2ds8.pdfIn PDF document text
    • http://aycotoro6.xyz/89283621463qqhfe.pdfIn PDF document text
    • https://cdn.sqhk.co/wijelukifap/qXSggja/is_there_a_puzzle_piece_emoji_on_iphone.pdfIn PDF document text
    • http://lyudi23.ru/ambulance_siren_ringtone_download_mp3chhkz.pdfIn PDF document text
    • http://shothard.site/71931243152hvt9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_60063a2a62079.pdfIn PDF document text
    • http://creditstar-kabinet.com/551518818471wfpk.pdfIn PDF document text
    • http://popularchoice.space/94491587387zgu0q.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/3ef87535-1495-4ba3-aaed-970ff3d43555/romeo_and_juliet_act_1_scene_3_short_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cd6529f-b48d-4680-841b-0ab141c338b0/12509063660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1bb62d-b37c-4c41-b490-21a98879e9da/kalomodakimajasegol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ed2a06-14bf-4390-8e6e-3199146b7cbe/72543625432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98259784-80cb-4d70-b263-27d6f6838194/learn_python_programming_for_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98B 5612 bytes
SHA-256: ce02b5aadfa1e149631a44625a66ac4c2324c4ec3b0e73fc4663164217ba9991
font_01_sfnt_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 10712 bytes
SHA-256: 312b9def1dd6009afcf27221fe7018a34a3ec16d180f047ec1ef8423686ec4ad

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