Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd1555a20843c00…

MALICIOUS

PDF

75.4 KB Created: 2021-02-13 12:22:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0c927d8c8396dc0ee86ec8cb777a35b5 SHA-1: 20c95a76a3bb5c5af48252b3acb7330b2659d69e SHA-256: 4bd1555a20843c00136d9184d971398d38208c198932aa5be503a1b6a078e16d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a high density of links pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

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://jottigo.ru/123?utm_term=accidental+woman+wiki PDF link annotation
    • https://cdn.sqhk.co/novujarogoga/VbhhOge/nifolamamele.pdfIn PDF document text
    • http://dalovujunaguk.22web.org/vixasolegab.pdfIn PDF document text
    • http://pusaburuku.22web.org/javosazepovewikupu.pdfIn PDF document text
    • http://trastenmyqort.online/future_tenses_will_going_to_presenttxpw3.pdfIn PDF document text
    • http://pshcomonhere.xyz/ernst_cassirer_philosophy_of_the_enlightenment77x6j.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/xm9yMhb/sesaredomo.pdfIn PDF document text
    • http://instasurprise.online/twitter_downloader_chromerhj4s.pdfIn PDF document text
    • http://wamuterireted.iblogger.org/peputetukomiropes.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/hijpGid/57473134461.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/Ywjjwa4/rapalagijigosikarojobego.pdfIn PDF document text
    • http://kinorio5.xyz/affirm_login_with_phone_numberbs5ud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://towawemigegi.epizy.com/pavexuwutafiwoferuvim.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/40132141884.pdfIn PDF document text
    • http://zopogapusokudip.rf.gd/android_10_q_samsung_s7.pdfIn PDF document text
    • http://zipodanej.rf.gd/66209096995.pdfIn PDF document text
    • http://wedutatitupaze.epizy.com/mindtap_answers_key_english.pdfIn PDF document text
    • http://lufefavi.epizy.com/facebook_business_description_template.pdfIn PDF document text
    • http://nazifaba.rf.gd/xebeson.pdfIn PDF document text
    • http://wuxodevidupibe.epizy.com/video_er_chrome_website.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_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 4956 bytes
SHA-256: 1de7bbfc9a47988f810786b0d8de5c336505d20b4f9dc9b52a8998adbedd47c8
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 10896 bytes
SHA-256: 743010cd17670eaae1cf62fa3dfc7680d508fea0febdde94fbe1b631c4705a9c

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