Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d3d6bfac9e14e8…

MALICIOUS

PDF

77.7 KB Created: 2021-02-11 19:41:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bfe37a6f367e023c06714b1e11c26b28 SHA-1: d070df7caf484e3916bc79769b9d1faa18252556 SHA-256: f9d3d6bfac9e14e8fc340eba5ef9cedd3f3a1b35711a62798924630fb54580da
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent link pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=how+to+see+your+subscribers+on+twitch+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4425727/normal_601cf6b3b0887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417032/normal_5ff33739b7b9d.pdfIn PDF document text
    • https://nufapapezo.weebly.com/uploads/1/3/0/9/130969462/a59ba932a5da7.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/0341507c7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420244/normal_5fc9a157140fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6015f174e47a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404976/normal_60062ba2b3747.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482407/normal_5fca2c5b8490f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425009/normal_5fdcca909c047.pdfIn PDF document text
    • https://pepuxopotu.weebly.com/uploads/1/3/5/3/135390253/nawebem.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/5243127.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/7458397.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456114/normal_5fe1511395bfd.pdfIn PDF document text
    • https://nagajaburelu.weebly.com/uploads/1/3/2/7/132740350/7114460.pdfIn PDF document text
    • https://keduwiwisa.weebly.com/uploads/1/3/4/4/134486116/5977383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_601460681949b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vekujekodabudu.epizy.com/89230709325.pdfIn PDF document text
    • http://kiwusumusi.rf.gd/softonic_chrome_for_pc.pdfIn PDF document text
    • http://luzeparuzibez.rf.gd/arp_protocol_tutorial.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_off0000ef47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF47 5420 bytes
SHA-256: 18cdc3f1d6aa0f2891da035d477666a9d702681093e5846991d44af030986ade
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 11276 bytes
SHA-256: 5906bafe4658b905be22d018871a782fd4b9a17a347a862ecc95d6f7b3136d0b

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