Malicious PDF — malware analysis report

Static analysis result for SHA-256 a79080c0dfc56c31…

MALICIOUS

PDF

78.5 KB Created: 2021-03-19 09:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 196b271a837df04663fe7efd56943252 SHA-1: 82fea71e0aefad58c840443bc7dcb322a88b8460 SHA-256: a79080c0dfc56c31c145365237218158e5fb42de4911b5085d8bbed70535ecf4
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which are disposable or known malicious redirectors. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/strik?utm_term=how+much+is+a+wii+sensor+bar+at+walmart In PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/buvidebas.pdfIn PDF document text
    • https://pagazamis.weebly.com/uploads/1/3/5/3/135310118/4350578.pdfIn PDF document text
    • https://viselejipu.weebly.com/uploads/1/3/4/6/134698272/42ad5208.pdfIn PDF document text
    • https://daradila.weebly.com/uploads/1/3/1/4/131438164/niterevixetu-jejamifo-bijumozuvifomag-dewepizemupum.pdfIn PDF document text
    • http://domavera.ru/wekezagagolenumavebu65u3n.pdfIn PDF document text
    • https://fuxugikitoze.weebly.com/uploads/1/3/1/0/131070560/7504e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482009/normal_5fcece63a98ae.pdfIn PDF document text
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/7682721.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460266/normal_603a9824d5699.pdfIn PDF document text
    • https://bimevaxufozuz.weebly.com/uploads/1/3/2/6/132683359/7477237.pdfIn PDF document text
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/a2774bf935f.pdfIn PDF document text
    • http://umkatrade.ru/is_ocarina_of_time_available_on_switchp5bcd.pdfIn PDF document text
    • https://jemikarabon.weebly.com/uploads/1/3/0/8/130815017/woxize.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/gafisa.pdfIn PDF document text
    • https://vabadagijuruka.weebly.com/uploads/1/3/1/8/131856539/dapudasate-ramunujur.pdfIn PDF document text
    • http://snatural.space/how_to_write_a_critical_analysis_essay_youtube1o8lw.pdfIn PDF document text
    • https://mubuvume.weebly.com/uploads/1/3/4/8/134885019/sikixek.pdfIn PDF document text
    • https://lixawedubofalat.weebly.com/uploads/1/3/1/4/131407760/pateladewen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_604a978d38a29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/ec7fa6a6-4817-4436-a89f-00111dc8c603/how_to_reset_tcp_ip_stack_windows_server_2012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb5cbf3-12b3-46b2-8734-77d1387cfa64/diagrama_de_equilibrio_de_fases_ternario.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5116 bytes
SHA-256: 951426f8ea5f84de995682025da13216edfeb48bce7c57348d45eec13d04c233
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 11720 bytes
SHA-256: 7c322685f938b0cc61253773567acd8acff047f3ee490d0434a16306b81dbcd4
font_02_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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