Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d95ebdc35abf848…

MALICIOUS

PDF

75.4 KB Created: 2021-04-07 18:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 340c5859d6648d1037752b33bf07a2af SHA-1: e6e2eb849f14fe55d50dd86af67c7322bacb0a1e SHA-256: 1d95ebdc35abf8489b14818bc3692012c60371c35dd35770c667534652e45c31
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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://resalured.ru/strik?utm_term=ireland+postal+address+format PDF link annotation
    • https://cdn.sqhk.co/jutafegobexe/I1Whjic/how_to_make_knives.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378848/normal_603c8944f1d77.pdfIn PDF document text
    • http://naxuvazexipok.sportsontheweb.net/mexico_frente_al_cambio_climatico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367281/normal_5fce1327bb306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420020/normal_6066e18b591c6.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/aLjenha/automaton_transfusion_zombie_movie.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f582293cc.pdfIn PDF document text
    • https://cdn.sqhk.co/patizuruf/vNgisq8/37165296198.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/gidjdWG/nuratoj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490001/normal_5fee8c7aa0fd1.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/gcByidf/teamviewer_free_filehippo.pdfIn PDF document text
    • http://liolika-rsya.ru/bojaxaffp597.pdfIn PDF document text
    • http://construt.site/goruzijogalidotobinovunaxwqsg.pdfIn PDF document text
    • http://seomagnat1.online/21850919993povap.pdfIn PDF document text
    • http://doorstepcomputers.com/who_is_the_highwayman_poem_based_onkmfcw.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/63066344065.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/naxozelozude/answer_artinya_apa.pdfIn PDF document text
    • http://zutugidod.onlinewebshop.net/dueos_de_los_medios_de_produccion_del_feudalismo.pdfIn PDF document text
    • https://s3.amazonaws.com/lomuper/the_rosie_project_review_aspergers.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/modapawukemusadutevik.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/baidu_app_store_for_android.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_off0000eb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 5124 bytes
SHA-256: baf71a7ff9cc5822b456f2dad1d2be137f6cfed5cdc4663687611a20dd1f5003
font_01_sfnt_off0000fcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB8 10528 bytes
SHA-256: ee2456886b2f848304f12671a36a4cd5dd34da01781f96adea8b5261fe0ff08e

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