Malicious PDF — malware analysis report

Static analysis result for SHA-256 f498e431d13f492d…

MALICIOUS

PDF

68.0 KB Created: 2020-11-13 04:12:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 14455f4d123820eae831294677193583 SHA-1: d2a33e568c5ad93085778bcceb0a0f27fcde833d SHA-256: f498e431d13f492dbf298b64ae77bfff3a41c3aae5df061b89ea81bcfde7d8e8
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic firings indicate this PDF is part of a link farm, likely designed to drive traffic to malicious or spam sites. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or SEO spam campaign, potentially leveraging embedded JavaScript for redirection.

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://gettraff.ru/aws?utm_term=wow+leatherworking+guide+1-+300 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378155/normal_5faa460ad30ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5f9fbb28ad2b7.pdfIn PDF document text
    • https://rabiwibunefa.weebly.com/uploads/1/3/4/7/134747284/5324421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5f93dac6bdc59.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/baziziroguvog-teronekox-lifuxi-najaloka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f8dcb71aca09.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/mexozixusimip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_5f92dbbbc8e8d.pdfIn PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/tesebepeged_figalerokuto_denuganaxajin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402519/normal_5fad5a1686636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5f8d4aa7bd131.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1363c03b-8ba8-4e36-8dee-0904ac49dd2b/27403874430.pdfIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/54669744417.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/95450317502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e3714fe-7be7-4e3a-b448-65c558dc29c3/mofakixuniwiwevefu.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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 5468 bytes
SHA-256: d4e1acb88474c95e9ae8f63b53586a51a594a432ec5436ca47347e54ce67c873
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 10664 bytes
SHA-256: 3e88327ae47dd9fe4c93df0ce24f4c03c1bda17db3442e57470f86d896c9ce48

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