Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91f0202e9945a5f…

MALICIOUS

PDF

70.7 KB Created: 2021-06-10 14:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: d11026c4319e7369e370c04e133db4ba SHA-1: e3cb04852ed80ebea9de29e79c6144e9b78751e9 SHA-256: a91f0202e9945a5fd00bd51654a045d64a3bf6da753c354de0558e72d508e8d3
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and forming a link farm, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and the ML classifier's high confidence further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://garglob.ru/pbw?utm_term=aayirathil+oruvan+video+songs+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445879/normal_606a915311b78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5ffd3b4bbad13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5fc8ee066949a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393883/normal_5fe278873c1b8.pdfIn PDF document text
    • https://gobadinemi.weebly.com/uploads/1/3/5/2/135299992/8713801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372721/normal_603c6a11a5713.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380691/normal_6004f9a5a33b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453342/normal_60307647781b8.pdfIn PDF document text
    • https://kobokudebixisog.weebly.com/uploads/1/3/5/3/135390699/7b928a22431024.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415936/normal_5fde5797c13e6.pdfIn PDF document text
    • https://nilezejexi.weebly.com/uploads/1/3/4/7/134737846/xexiwiwuf.pdfIn PDF document text
    • https://kuzikumivinoli.weebly.com/uploads/1/3/4/2/134235757/8914705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jixerumuji.pbworks.com/f/calls_blacklist_pro_apk.pdfIn PDF document text
    • http://mugobug.pbworks.com/w/file/fetch/144793884/cocktail_waitress_job_description_cv.pdfIn PDF document text
    • http://sagidetubi.pbworks.com/f/central_place_theory_frq_ap_human_geography.pdfIn PDF document text
    • http://tevimunon.pbworks.com/f/kinetic_molecular_theory_simulation_lab_answer_key.pdfIn PDF document text
    • http://fosirodovo.pbworks.com/w/file/fetch/144453453/2143926228.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144681306/dezeguvojuxekome.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/f/how_to_use_a_one_step_polaroid_land_camera.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/t95m_4k_firmware_update.pdfIn PDF document text
    • http://fubajulak.pbworks.com/f/overlord_light_novel_download_epub.pdfIn PDF document text
    • http://mawasuwov.pbworks.com/w/file/fetch/144565506/a_beginners_guide_to_constructing_the_universe_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_off0000d847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD847 5332 bytes
SHA-256: 4455fe5d876200abb0541a7c21724e1f7a3a02336c38cbbea7f7c038a5f45637
font_01_sfnt_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 10028 bytes
SHA-256: 6c95b9295719763103e7ebfc5093d99d8aedf753451d956c7619338a91e50d21

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