Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e70a84ce3c712cd…

MALICIOUS

PDF

136.0 KB Created: 2021-02-27 04:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: ba8a2d634825b73aa8a62d3ce584d569 SHA-1: 31fe6d12c7842c178eea6db1da12c67aa9b53835 SHA-256: 3e70a84ce3c712cdd5c49df221de86c17a1632f39646f755d2ecb4e65ec51509
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to deliver second-stage payloads.

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://zajinet.ru/award?keyword=cuantas+semanas+tiene+el+a%25C3%25B1o+2018 PDF link annotation
    • http://smeshnoykir.space/up_scert_books_download11t4j.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/how_many_carbs_are_in_shipleys_donut_holes.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/aOgfuja/96983455147.pdfIn PDF document text
    • http://kumazekewenow.22web.org/jotijapavavu.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/haDjihb/download_photo_editor_color_effect_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/zudipoje/3jfhdgf/happy_birthday_song_stevie_wonder.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/ZjTjbgv/zombie_royale_warzone_lag.pdfIn PDF document text
    • http://solimurelorobiv.iblogger.org/national_board_contextual_information_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/6YI7ijX/ribugokotulonu.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/90427006441.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/price_of_lexus_gx_460_in_nigeria.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/YLDNhdx/defajovopipogul.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/ZBTIVZR/download_game_fidget_spinner_mod_apk_android_1.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/58794066045.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/seguxomasewageditego.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/g65qdha/25068721009.pdfIn PDF document text
    • http://rovepofaji.22web.org/97403835303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fataragoreb.myartsonline.com/rimabi.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/42796160151.pdfIn PDF document text
    • http://damewanobojojo.rf.gd/piketiturojuniwelusepe.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_off0001d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D50B 5372 bytes
SHA-256: debf2f3dcfd1425da43e6f46b893abae1787faa211e74d8b3c40a3227cf02efa
font_01_sfnt_off0001e6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E6F7 12700 bytes
SHA-256: eca8551a4ab8006d7fb375a36bc76972a974d0344c848d3c7cea8cb5fcafb407

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