Malicious PDF — malware analysis report

Static analysis result for SHA-256 807d5bea811bb6ba…

MALICIOUS

PDF

73.0 KB Created: 2021-03-24 02:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8d87a51d3a5f32037e4ecbcf69e0387f SHA-1: 2294402b8d3101cb2da9990a5707281ffccb0313 SHA-256: 807d5bea811bb6ba17167226323cbdb8c951f02640d6ecb5cdd375e297e38436
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links pointing to external PDF files hosted on disposable domains, a common tactic for SEO spam or malware distribution. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to potentially malicious content via a link farm.

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
  • 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/award?keyword=bernal+diaz+castillo+historia+verdadera+conquista+nueva+espa%25C3%25B1a+pdf In PDF document text
    • http://medolufinumul.sportsontheweb.net/50623647597.pdfIn PDF document text
    • https://zudezujom.weebly.com/uploads/1/3/1/3/131384555/fizejoduwatuso.pdfIn PDF document text
    • https://cdn.sqhk.co/rozamulev/nicQ3OX/38662860147.pdfIn PDF document text
    • http://fegiroxopirez.sportsontheweb.net/60952477432.pdfIn PDF document text
    • http://mowukedova.mypressonline.com/gegutunixabedored.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/jHfhdU5/92998784701.pdfIn PDF document text
    • https://gunajogozezulom.weebly.com/uploads/1/3/5/3/135385825/7816319.pdfIn PDF document text
    • https://cdn.sqhk.co/jujirepak/Ajj5Iig/bemibexijogenubinipotasag.pdfIn PDF document text
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/ebaf7c31d4.pdfIn PDF document text
    • http://tigadugutuvatix.mygamesonline.org/22577477119.pdfIn PDF document text
    • http://sewalenugebob.iblogger.org/39500236448.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/ggyk624/17468123323.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/iihgc1T/52335013697.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/eghT8rQ/neck_check_for_thyroid_cancer.pdfIn PDF document text
    • https://xadinizojagum.weebly.com/uploads/1/3/4/0/134016813/diluranerobaw.pdfIn PDF document text
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/c8eee57f67f.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/ilustraciones_para_predicadores.pdfIn PDF document text
    • https://voteriboxovoviv.weebly.com/uploads/1/3/4/3/134352377/xomikasa.pdfIn PDF document text
    • https://bijuxoku.weebly.com/uploads/1/3/4/9/134901677/zekanixut_naxope_zitezaz_wivavefipusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dubomebivenu.epizy.com/1335499208.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_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 5740 bytes
SHA-256: 667a0dfdaeed9683d1b945844fb82631918d7b5dc8ca5ab3b9c6a5a25ecb1e48
font_01_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 11984 bytes
SHA-256: 42ef26bfdf1723b365178eae318a0fe7e5ed8c36b149f60a0f2e8ec0d24034e7

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