Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b9fcf43fb13fce…

MALICIOUS

PDF

104.2 KB Created: 2021-01-20 23:16:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 726cb2798e9b23f2303099a7c6a1aca7 SHA-1: df7ee7514371090d79727b4bdc43bf536867d5a6 SHA-256: 09b9fcf43fb13fce0a92d9eab5f099a3c22458c85395e30229672c03eabebea5
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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/123?utm_term=voy+pageant+guru In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379859/normal_5f927e02dbdbf.pdfIn PDF document text
    • https://kasewipiliri.weebly.com/uploads/1/3/4/9/134901701/6784157.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375909/normal_5fe0cd22d0035.pdfIn PDF document text
    • https://ropugobefele.weebly.com/uploads/1/3/4/4/134445072/jezadanodiru.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvotalek/jajgjjd/41179912241.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/bizoxezaje-gagixelisaseko-biseraki.pdfIn PDF document text
    • https://duzezefoge.weebly.com/uploads/1/3/1/4/131437668/8516146.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491687/normal_5fecccaeadac9.pdfIn PDF document text
    • https://lefizedut.weebly.com/uploads/1/3/2/6/132681647/jusavovodugave-zulerodekax-wutusemujiz.pdfIn PDF document text
    • https://berigagagek.weebly.com/uploads/1/3/1/3/131384675/3935250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489976/normal_5fd6dea9e6b1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5faf3bcbf06dd.pdfIn PDF document text
    • https://cdn.sqhk.co/mujexoxa/Hhi6jcV/xupofewukasebowosuriku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370525/normal_5ff2891c0d994.pdfIn PDF document text
    • http://rakuropa.iblogger.org/free_water_brushes_for_photoshop_cs6.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
    • http://badivisixeg.epizy.com/56606468460.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_off00014dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFC 4676 bytes
SHA-256: 7f0b08f3e9176ba26ee40cf3fef3ac06b03dcfd3aa7bb854f2062eb021ecaa98
font_01_sfnt_off00015df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DF4 11672 bytes
SHA-256: 85379725db71ed57dbfa28e5d7dd473319649e4ddf2f5665b63fd62db408b9e3
font_02_sfnt_off00018599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18599 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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