Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea5efb614ae2fc0…

MALICIOUS

PDF

91.3 KB Created: 2021-02-05 11:03:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 044983bb3f49b8c185b08ec94de0ba44 SHA-1: 73a067fa7c8d498b01973044d453b56bcdabf352 SHA-256: 1ea5efb614ae2fc0cc4b33e2dbf361a18523a62b6378a439d4c1650b65358412
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms, indicating a phishing or SEO spam campaign. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a link to 'yafferge.ru' as malicious. The ML classifier also strongly indicates maliciousness.

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/aws?utm_term=cooking+tools+word+whizzle+search+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fda2d96e5011.pdfIn PDF document text
    • https://cdn.sqhk.co/moturira/Kpighac/time_dodgers_game.pdfIn PDF document text
    • https://federadedeladol.weebly.com/uploads/1/3/4/6/134626130/5046293.pdfIn PDF document text
    • https://cdn.sqhk.co/nalomuxe/BHAmfjd/pelijofagevojuxolaxusari.pdfIn PDF document text
    • https://kiwaposuxixu.weebly.com/uploads/1/3/5/3/135329520/nogewoverufuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489838/normal_5fe87331d94f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494677/normal_5fcd75c729f53.pdfIn PDF document text
    • https://cdn.sqhk.co/jivapereb/jegfyie/99395251831.pdfIn PDF document text
    • https://cdn.sqhk.co/vowobupubuze/fmIuTaK/wedovasoludukaxafamuze.pdfIn PDF document text
    • https://cdn.sqhk.co/pemenixa/VAbgegi/vumifofaros.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450047/normal_5fd613f7e0691.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/agc3b4L/74356634763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5ff6a2493d35b.pdfIn PDF document text
    • https://pofomagod.weebly.com/uploads/1/3/1/4/131483550/4970024.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/4vsicBV/tunuvelolesuxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419637/normal_5ff46163b932e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 5312 bytes
SHA-256: b632cdb39608243dde511216d1753dd90aaa8587eb26d1ae28551648d084f042
font_01_sfnt_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 10608 bytes
SHA-256: 2656fbac3ee43b92ba539110f2875d1157e2cdcad360a2d76e862086f62241cc

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