Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb0e6f8d6b5627b…

MALICIOUS

PDF

80.9 KB Created: 2021-03-26 11:36:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 05320be712c8e72c540aaab38e5381d8 SHA-1: 425c6cc17ae90bafe00ac00b857ef048289a75e8 SHA-256: 2bb0e6f8d6b5627b26d53c5a41b100b22896ee87f18a9ed49c0de54d8ac6e22b
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external PDF files hosted on disposable domains, likely for SEO manipulation or to host phishing content. The embedded URLs and the PDF structure suggest an attempt to disguise malicious activity under a seemingly legitimate topic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://ponafet.ru/award?keyword=biotechnology+applications+in+medicine+pdf PDF link annotation
    • https://lividuxu.weebly.com/uploads/1/3/4/3/134354071/fewufarifowax.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/iOjcGx2/34481633075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482623/normal_5fc72a170c1e8.pdfIn PDF document text
    • http://fotodosajube.22web.org/babizefigeriza.pdfIn PDF document text
    • https://wugedelujexot.weebly.com/uploads/1/3/1/4/131456191/pekeke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374376/normal_60062f4e941b4.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/christmas_carol_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tazifawixax/ihgd3BQ/ganipularunofo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414358/normal_6029f0a30ae00.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/uifm7lt/56540307306.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_5962882936da41c5a91fc7ebc4afcfc3.pdf?index=trueIn PDF document text
    • http://nedizilunok.myartsonline.com/zadoritigo.pdfIn PDF document text
    • http://joxegav.rf.gd/tufurebigibuzupakotabimo.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_94e9f54f9970410c8bd13ce1bc1ae704.pdf?index=trueIn PDF document text
    • https://d1159ab4-cbf5-42eb-897b-83a5e94cd7da.filesusr.com/ugd/536122_c2956f74ae6440d4b2021201eb826ff9.pdf?index=trueIn PDF document text
    • http://pojuzuduxotazup.epizy.com/mannarkkad_weather_report.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_3f833424a8b242db924ef7cc391e4adf.pdf?index=trueIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/c_tran_bus_schedule_route_37.pdfIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_80169b1840ca42f48baca37ece252299.pdf?index=trueIn PDF document text
    • http://pitugozuput.epizy.com/21646336001.pdfIn PDF document text
    • http://burupilejeg.epizy.com/26288522939.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_off00010042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10042 5624 bytes
SHA-256: 3fb02c47f13578c7ff43b892d4f5e0f7b41b31b204860ab8f47852d53fd966bc
font_01_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 10196 bytes
SHA-256: 50d3f74e46e5615c7f00ebf39a1492171d7d588aaaddb8fb52e93d3a5c3c6644