Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ebbc568683b748…

MALICIOUS

PDF

103.2 KB Created: 2021-02-04 11:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fac62878d289f9794942b72bcda1fab9 SHA-1: e2715cf5310444d0cbc98ea59dfa4c8b4b83b26b SHA-256: 52ebbc568683b748341181e9fbf5efd2fcbd525dda86d4373587db81c5740a41
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of external URIs and the overall structure point towards a spearphishing attachment attack pattern.

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://baarspo.ru/123?utm_term=the+motorcycle+diaries+screenplay+pdf PDF link annotation
    • http://pr-bux.online/zuvorilizrebhy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5ffe7d5440a24.pdfIn PDF document text
    • http://matras-24.ru/mamopilqy2t.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/giiHwjc/huawei_health_9_apk_download.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/46462623475mfz2u.pdfIn PDF document text
    • http://ronerikasov.22web.org/insheet_command_stata_csv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418385/normal_5ff92dc8e4ee4.pdfIn PDF document text
    • http://mybatut.store/nissanconnect_ev_app_reviewy3mbx.pdfIn PDF document text
    • http://xsafak.com/kapowusoduporuvevonopaktsu0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455890/normal_5fd0334fa65cd.pdfIn PDF document text
    • http://qlemelest.online/nufepitavudld3k.pdfIn PDF document text
    • http://shoop-fk.ru/vebusowinoxejobimosa11v.pdfIn PDF document text
    • http://jakartapro.xyz/64453011652qtrsr.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/ziwuvijevo/39403557712.pdfIn PDF document text
    • http://linexiziretewoj.rf.gd/hard_riddles_but_easy_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/caresource_georgia_provider_forms.pdfIn PDF document text
    • http://fububosuvakosal.epizy.com/2018_hollywood_films.pdfIn PDF document text
    • http://toxukagaxopud.epizy.com/autotune_vst_plugin_windows.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_off00015976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15976 5444 bytes
SHA-256: 7eedccb782d764d63a28779d009785aa54d7b1e5aaf437c85b57cf7a6de0f2e6
font_01_sfnt_off00016bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BD4 10360 bytes
SHA-256: 6504d32ccc877901cc88122853e72237de6b631ee20de103152b830214623c70

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