Malicious PDF — malware analysis report

Static analysis result for SHA-256 d116a9b51f24f298…

MALICIOUS

PDF

74.1 KB Created: 2021-06-07 20:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 97243359bd47b8ac77cd1cabf446bcd3 SHA-1: 57ff398ece1efc77ee1862b71779ebe947ccdb42 SHA-256: d116a9b51f24f298cc0bf9a35c8d709295d571bdf5fb99effd0935bb4011248d
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is classified as malicious by ML and ClamAV. The document body, though heavily obfuscated, suggests a lure related to legal or official correspondence. The primary malicious URL, https://medvor.ru/pbw, is likely used to host a phishing page or deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://medvor.ru/pbw?utm_term=early+release+from+probation+letter PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454420/normal_5ff3e9b6807c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_601bce1c37d97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_603ed4891de40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_605842eba441c.pdfIn PDF document text
    • https://lovelutunaguj.weebly.com/uploads/1/3/4/7/134735325/5cf096b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470389/normal_600075492c4b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449009/normal_5fec69b6b0e22.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485828/normal_5feb2e8410d86.pdfIn PDF document text
    • https://damozudi.weebly.com/uploads/1/3/0/7/130776403/loletagepuf_famovu_gojelilijakid_baxejurubag.pdfIn PDF document text
    • https://nekekijubexofus.weebly.com/uploads/1/3/4/5/134587401/viwarezipol-tavesej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383452/normal_60531d0e65595.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bopelijexuf.pbworks.com/f/soap_and_detergent_business_plan.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144424731/61667316542.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/10322901313.pdfIn PDF document text
    • http://ziduzobif.pbworks.com/w/file/fetch/144455952/why_is_my_polaroid_speaker_not_working.pdfIn PDF document text
    • http://sejiliki.pbworks.com/f/45061705153.pdfIn PDF document text
    • http://veputuvus.pbworks.com/w/file/fetch/144757332/mikemis.pdfIn PDF document text
    • http://metudebebi.pbworks.com/w/file/fetch/144595032/panoju.pdfIn PDF document text
    • http://zeratuwolima.pbworks.com/w/file/fetch/144536859/mosipikakiwazo.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427254/como_hacer_autos_con_cajas_de_carton_para_nios.pdfIn PDF document text
    • http://nusometa.pbworks.com/f/how_to_use_socket_wrench_with_drill.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_off0000e343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE343 5244 bytes
SHA-256: a3f26070dd2afef733644c0f48bd273a10f3ba2c4857d99a7385c59e0348f030
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 11312 bytes
SHA-256: 11866d06b661883bb4b135b7e8ab5e792adc1b319159e6b9aea7562859679a52

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