Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5536ba11f606b3…

MALICIOUS

PDF

69.0 KB Created: 2021-02-21 21:57:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d684fa65c20a52b02321f1eb09bc68d4 SHA-1: 7dbb554053de81b4b6cb27deaf43b3132c2c327b SHA-256: 3f5536ba11f606b3cba908555ca271af9779e2475378d270e74a737007561a3d
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=auto+electrical+courses+in+south+africa In PDF document text
    • https://static.s123-cdn-static.com/uploads/4367311/normal_5ffef8555bd5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_601bdd92cec7f.pdfIn PDF document text
    • http://wopafopu.22web.org/netote.pdfIn PDF document text
    • https://subefivu.weebly.com/uploads/1/3/4/6/134688636/xogunaxilil_furinosa_tipuludomebefag_mulibiluji.pdfIn PDF document text
    • http://zageketukux.iblogger.org/hp_photosmart_c5280_all-in-one_manual.pdfIn PDF document text
    • https://kedifekutijita.weebly.com/uploads/1/3/4/7/134713117/e4ac8b1b7e2.pdfIn PDF document text
    • http://fufivepibagat.iblogger.org/20926840105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424026/normal_5fdffd2b38fe5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418755/normal_5fce76f93e424.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_5ffdd7b39651b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374537/normal_600103fa59a95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuzugewidided.rf.gd/ravupixupubojixerulakag.pdfIn PDF document text
    • http://ratosore.epizy.com/tv_advert_script_template_ks2.pdfIn PDF document text
    • http://vewokepewaki.epizy.com/lazakikitim.pdfIn PDF document text
    • http://rugadugekowe.epizy.com/proper_annotated_bibliography_format_mla.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_off0000d1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CF 4956 bytes
SHA-256: ada891447b2ccfe4ca6b3179ae3eb91860c80dda8cf9832cc3889e82eaa7a961
font_01_sfnt_off0000e2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A2 10392 bytes
SHA-256: 9836f19e44b64942b096200a1059f2f08dc1518df14bf35fbbac2d151b0e6f56