Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71fff468b90b7cf…

MALICIOUS

PDF

74.6 KB Created: 2021-03-29 21:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 3d50b60ffdb3db1680968cee55eef244 SHA-1: 0506be6d46c8e35a2887009849a55da7d81c2e20 SHA-256: b71fff468b90b7cf57b85deb82f551dfb50ac0c9dfdcb97a44006f862ad0179f
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://yafferge.ru/strik. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to potentially malicious or unknown domains. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=a+stranger+in+the+house+book+synopsis In PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_60488d904a1a5.pdfIn PDF document text
    • http://milesatel.mygamesonline.org/26553375248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_6016444f7273b.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/tabla_periodica_interactiva_en_espaol_gratis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416501/normal_6042c18b90843.pdfIn PDF document text
    • http://tanivikovome.sportsontheweb.net/9762186126.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fe4d48c2cad8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406789/normal_600ea780e6545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448720/normal_6050c877e950e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_6040436171e2c.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/dell_optiplex_760_memory_configuration.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tokit/54524450991.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/nibebijurapowame.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/dodegokolurusugedasexajo.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/64558167584.pdfIn PDF document text
    • http://motuvogipe.onlinewebshop.net/basic_acrylic_painting_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/77628231528.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/netaviluwoput.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_ae8274be29f0441ea05ad48fac7869f6.pdf?index=trueIn PDF document text
    • https://9e1b5e4e-b4ab-405b-8fdf-b3b6d7b19c28.filesusr.com/ugd/94ea38_7cf77786890242009c1652d16c7b148a.pdf?index=trueIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_98c1b092f7334c749608549bc0734d15.pdf?index=trueIn 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_off0000e4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A0 5344 bytes
SHA-256: 4ebe3d26efd58b42ca80615e2d343ac9ce1261aa2b51c4380ce293ac3ad67725
font_01_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 10736 bytes
SHA-256: c1944da2f4ff0fef3e08dda52f06d9578d2b68337ca3506d101e71247dc40a80

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