Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b3c1505a0a472f…

MALICIOUS

PDF

77.0 KB Created: 2021-02-13 06:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1150733a5ae4947380cad56347695dd2 SHA-1: a5d318a7d4db648df6733788849548524c350dee SHA-256: 49b3c1505a0a472f776bd0d783228d9c5a75a9510d301c0c9eb0455b94cf91c6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external domains, many of which are hosted on disposable or link-farm-like services. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

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://maypoin.ru/123?utm_term=matthey+middle+school+football+schedule PDF link annotation
    • https://duloduwo.weebly.com/uploads/1/3/4/8/134850843/3152545.pdfIn PDF document text
    • http://lotto-investclub.com/fakewokug8yh09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527042/normal_5ff5fbb16e969.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/hfncJja/gebunawafigibepuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420612/normal_5ff3c32b726c9.pdfIn PDF document text
    • http://fakaripeti.xyz/bvr_video_recorder_pro_apkrydmm.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/jhhG3PX/wumef.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/7Vhhhef/fefexesuvoluwom.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/gehbihc/20295341855.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/80524bf2ae315.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/ihgiBid/rv_camping_near_park_city_utah.pdfIn PDF document text
    • http://gufutaca3.xyz/multicore_architecture_and_programming_technical_publicationsmedah.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/0jgja6X/voice_recorder_for_windows_7.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/batiku/wusilasuzumadovizokar.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/adrenalize_ft._adn_get_up.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/attitudes_definition.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_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 5412 bytes
SHA-256: e5365b7ed0ad24faae19d4232fc61c2f175c6b63a503693b32cd87323d059e73
font_01_sfnt_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 10732 bytes
SHA-256: abec03dbca321d1febddbb07dc7ed7e2f6dc8ad4f9962d06416d8ad2b406aa33

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