Malicious PDF — malware analysis report

Static analysis result for SHA-256 b715d55adacab4b5…

MALICIOUS

PDF

66.2 KB Created: 2021-02-27 12:31:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e074a9d36039c6f9617d698fa7de8b47 SHA-1: 646330e9529bebc20549998346350d40b43fcdf8 SHA-256: b715d55adacab4b576b663c895ee21b1870b354bea5218596f28da4d0af63b54
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The presence of a link to a known malicious redirector further supports a malicious intent. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://dafemum.ru/wb?keyword=what%20is%20accela%20wash%20in%20kenmore%20washer In PDF document text
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/dugosoxex_kovefapizudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417658/normal_6010476001ffe.pdfIn PDF document text
    • https://zipapujemufosir.weebly.com/uploads/1/3/5/3/135392102/kanijepifadabir-zopew.pdfIn PDF document text
    • http://lumacy.site/finite_element_method_analysisko5j1.pdfIn PDF document text
    • https://zesakexe.weebly.com/uploads/1/3/5/3/135314388/9603231.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/lamimifigifo.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/fezejitixizu.pdfIn PDF document text
    • http://libuwapuvewipev.mywebcommunity.org/gexuk.pdfIn PDF document text
    • https://zojovotonoturur.weebly.com/uploads/1/3/5/3/135348007/8a281.pdfIn PDF document text
    • http://kixorita.22web.org/rufufoguzewejit.pdfIn PDF document text
    • http://zizopeja.22web.org/karoda.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/40960935345.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483591/normal_600a670a1fc8a.pdfIn PDF document text
    • https://beluxavin.weebly.com/uploads/1/3/4/5/134507718/dibimewub.pdfIn PDF document text
    • http://jalazekesofijot.medianewsonline.com/best_convertible_car_seat_2020_safety.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/english_writing_for_beginners_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofupiwosilabo.epizy.com/sosejewodariwaju.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_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 5208 bytes
SHA-256: e8a52c073a07e833c8d3f608e7a71864901e11467f9f1391208d6cf7ca5f6e58
font_01_sfnt_off0000d93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93F 9780 bytes
SHA-256: 4dbdea7ba6160285740244a20f0dcacb56f47a2552193dd6b2e79eae2c8a360a

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