Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b014315b568053…

MALICIOUS

PDF

84.5 KB Created: 2021-02-24 06:41:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5ae68f13515a0029d5b762ffd572199a SHA-1: b3f1aeff69b67590c3efec5ca631b57c2fd41b77 SHA-256: a7b014315b5680532fc480c6e2a6ebe47119b29b81b8e8c99ee9f49dbd326d47
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting services, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title suggesting a lure, 'How to write a short critical response', which is likely a pretext to direct users to 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://seumenha.ru/123?utm_term=how+to+write+a+short+critical+response PDF link annotation
    • https://cdn.sqhk.co/bulixanejad/bjehdBA/89680936180.pdfIn PDF document text
    • http://navewezaninub.iblogger.org/88710075165.pdfIn PDF document text
    • http://tatabumilik.iblogger.org/tipozulefili.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5fcbd8c5b6796.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_60248e8ae0c01.pdfIn PDF document text
    • http://fenopageliterow.iblogger.org/contrato_de_arrendamiento_de_local_comercial_sencillo_en_venezuela.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/8gjcC5p/rigelevino.pdfIn PDF document text
    • https://cdn.sqhk.co/wigetoxeveka/hdGPjEC/spinal_tap_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/jf3Sjac/different_notification_sounds_for_different_apps_samsung.pdfIn PDF document text
    • https://cdn.sqhk.co/lokabawopup/jU72jeV/my_boy_gba_emulator_download_apk.pdfIn PDF document text
    • http://xugafigipi.22web.org/next_online_application_answers_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_601afef01e181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_601ceeaeb4cf9.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/nigimul/vozafuno.pdfIn PDF document text
    • http://konazosite.epizy.com/loxomazotifivuwajizale.pdfIn PDF document text
    • http://gesesasogibigaw.rf.gd/bcom_degree_certificate_form_2018.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 5076 bytes
SHA-256: 26203975a7f8c2ad0bd42927a6e95da9c21da6b8f1d7c241909f23e8c8b4191a
font_01_sfnt_off0001217e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217E 10272 bytes
SHA-256: c6ae679fb08ad04327900e3b6bfa4881cc05105b3a00a72a28c27125a201ab0f

Open this report in the interactive analyzer, or submit your own file for analysis.