Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cd36a2204d1064…

MALICIOUS

PDF

76.2 KB Created: 2021-04-24 01:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 06bc544251837cb958c618e10b6cf6bc SHA-1: 51f01adc2b6688474ee3ffb2ddcab33acfb3b0e0 SHA-256: d1cd36a2204d1064dbb712051fc4d3b42ccf4d8ae9ad9e019e8ffc7106426d1e
252 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=download+java+8+for+redhat+linux+64+bit In PDF document text
    • https://cdn.sqhk.co/gibuzini/e0Ghfhc/hotstar_app_for_android_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/eKH2QAD/23776872501.pdfIn PDF document text
    • https://cdn.sqhk.co/pavupaken/ibhhja1/40389669509.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/how_much_is_a_first_edition_harry_potter_worth.pdfIn PDF document text
    • http://gisujug.mypressonline.com/also_sprach_zarathustra_indonesia.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/r25o0hb/91087345206.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/w8Whgjg/mexomivitagisimoruwiviri.pdfIn PDF document text
    • https://sezosuxinowa.weebly.com/uploads/1/3/4/2/134266263/wurugedikevavupara.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/d1heipT/zabevodonadamuxaradinaki.pdfIn PDF document text
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/7d49f65cd21a9.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/j84Aoii/classic_arcade_52_in_10.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/90391511093.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/gghjjd4/dizefa.pdfIn PDF document text
    • http://viwafuxofiseko.getenjoyment.net/antrenmanlarla_geometri_2._kitap.pdfIn PDF document text
    • http://gubixazolela.sportsontheweb.net/30414620557.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_439c5014b0934adaaa08fbd799a7a1b7.pdf?index=trueIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_b161131c387242ed9f5e72b1990a32b2.pdf?index=trueIn PDF document text
    • http://sajoveguduv.onlinewebshop.net/wabewi.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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 5688 bytes
SHA-256: 5a31217d61a83fae27919baa959f0884802dc3396bc97acbd70a3ed39d74b324
font_01_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 10624 bytes
SHA-256: 977bcdc09d6bde7e30ebb18ddf29487be66ea6878c484a592e30418927f82590

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