Malicious PDF — malware analysis report

Static analysis result for SHA-256 3924774ce29095f1…

MALICIOUS

PDF

71.4 KB Created: 2021-03-23 06:34:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: c278a816e34f82b9acf3175100127652 SHA-1: 9ce57f62522d9df299687000b5b442ae59338ad1 SHA-256: 3924774ce29095f1da43b5a44365b3b777205b887be74e371399077cee30ea02
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links pointing to other PDFs hosted on disposable domains, suggesting a link farm or phishing operation. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic strongly suggest the primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/award?keyword=about+computer+science+pdf PDF link annotation
    • https://lopazilavorelid.weebly.com/uploads/1/3/4/0/134097689/vejel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_60480a7f0c81d.pdfIn PDF document text
    • https://motuzepiruwilo.weebly.com/uploads/1/3/4/3/134348631/nemubabaginod_tejubikesaxetam_kokos_dixetotomuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506131/normal_603f2754a3fb5.pdfIn PDF document text
    • https://jofilelaritavux.weebly.com/uploads/1/3/4/1/134108607/3226918.pdfIn PDF document text
    • https://woremudof.weebly.com/uploads/1/3/4/7/134701645/191320.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402740/normal_5ffb763d16133.pdfIn PDF document text
    • https://bajigexok.weebly.com/uploads/1/3/4/1/134131467/1738143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368242/normal_601709dc5bcc2.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/95dee.pdfIn PDF document text
    • https://vetolotex.weebly.com/uploads/1/3/1/3/131379132/fibozo_woxokasotukekup_jaxexevofujuxe_pitaru.pdfIn PDF document text
    • https://zenavepofiwu.weebly.com/uploads/1/3/1/6/131607810/e44ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_60212c03cfd79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f60c2b61-a056-47c3-972c-b304eb7f8267/37647140095.pdfIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_62bd779c3faa48dfa85a3a7aa8cf90ba.pdf?index=trueIn PDF document text
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_91a69a65934a4b479946065b78f490ae.pdf?index=trueIn PDF document text
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_b3001e1556464a718c529067c27879dd.pdf?index=trueIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_fa95cceb0d0644958095c970c9a3475b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6f736f8-a616-4195-ba97-61992a126a7d/tadajuzudukuwel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53850579-63bb-4345-9cac-c6f029aa38eb/cast_of_power_book_11_ghost.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_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 5188 bytes
SHA-256: 1c9295c51e1cb4cc17c4622c3626c825e03345fdab88a62c58310f9fac99fbe1
font_01_sfnt_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 10424 bytes
SHA-256: 5ea47e61c906e39dd6a581799b1c4061acb9f812bf7bfc9c0bea0c63f3fa16d8