Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f53cfe1f866d4f…

MALICIOUS

PDF

74.1 KB Created: 2021-03-09 16:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b850f3ede001aa07fdd1c3c98bbfbc42 SHA-1: 17d482388eadd0da784f0bf2284eb183ec8e5e85 SHA-256: 96f53cfe1f866d4fb4f65f22622c90818f0100bd5990345517e7a719256a289c
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URIs, with at least one pointing to a suspicious domain ('vilenefex.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a deliberate attempt to obscure malicious links within a large number of external references.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://vilenefex.ru/wix?keyword=xbox+360+wireless+internet+adapter+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485445/normal_5fd76e70d03f5.pdfIn PDF document text
    • https://cdn.sqhk.co/posogamumut/PohigfI/42576674701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_603f3782468ee.pdfIn PDF document text
    • https://luvatuxi.weebly.com/uploads/1/3/4/3/134321506/xuvoripenabos.pdfIn PDF document text
    • https://gilasagajeradek.weebly.com/uploads/1/3/4/6/134632792/fojimojekupozaxubij.pdfIn PDF document text
    • http://tiwujatujoput.mygamesonline.org/how_to_calibrate_oven_thermostat.pdfIn PDF document text
    • https://xabisipejerifo.weebly.com/uploads/1/3/4/6/134634854/savebexewexonifex.pdfIn PDF document text
    • https://gupaxapofigovi.weebly.com/uploads/1/3/4/3/134356466/zilewuligufodoboke.pdfIn PDF document text
    • https://naxizugopigonav.weebly.com/uploads/1/3/1/4/131408516/efbaf0c2796.pdfIn PDF document text
    • https://jigugelelatowo.weebly.com/uploads/1/3/1/4/131437208/raxajomazev.pdfIn PDF document text
    • https://cdn.sqhk.co/rakujolo/hcxagjf/spellbinders_platinum_6_cutting_plates.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/ghbhajf/htc_desire_820_backup_software.pdfIn PDF document text
    • https://cdn.sqhk.co/xonizarisu/tgfVibX/hungry_shark_evo_unlock_all_sharks.pdfIn PDF document text
    • https://basapozixuw.weebly.com/uploads/1/3/4/7/134701575/e1c48af.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/how_to_charge_ps4_gold_headset.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/rudexisimunewagakexado.pdfIn PDF document text
    • http://fumibilulad.atwebpages.com/bonheur_d_occasion_livre.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/aatish_movie_status_video.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/13799624237.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_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 5840 bytes
SHA-256: 6416cc3cd5fe9392e116096aa268fe5b8961a5ea011b83cb09e3ce7540615347
font_01_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 10216 bytes
SHA-256: 95834123e5dec9ecce84578dffb56683b1a8ea20fe00a4f2f83bb245287288cf

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