Malicious PDF — malware analysis report

Static analysis result for SHA-256 f815d4cb75209bb5…

MALICIOUS

PDF

71.9 KB Created: 2021-02-22 13:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e2f795334743dfbc02a245a8948c343c SHA-1: ad356ddeff4ef5750327aea346b14f39a253d849 SHA-256: f815d4cb75209bb5e403b9de0940efb42a379bc6612d1397cd048bc564a909a8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jottigo.ru/aws?utm_term=las+cronicas+de+narnia+4+pelicula+completa+en+espa%25C3%25B1ol+latino+hd PDF link annotation
    • https://gojafone.weebly.com/uploads/1/3/4/8/134891791/3876356.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff65481d4f2a.pdfIn PDF document text
    • http://wofeboz.66ghz.com/transformers_fanfiction_prowl_sparkling.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_602a6d515e974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417220/normal_6026339eb683c.pdfIn PDF document text
    • http://salonop.xyz/17982319347vstzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474734/normal_5fe4f36cc9e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459337/normal_5fe874acddbdc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461202/normal_6019f5d7b41a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369776/normal_5fcbb0487eb7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fe32d43d3905.pdfIn PDF document text
    • https://zenamuvevabun.weebly.com/uploads/1/3/1/4/131453902/sulewoxodulifad-senunonapupir.pdfIn PDF document text
    • http://naxawibumeso.iblogger.org/anagram_puzzles_with_answers.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/fasudikek/isbn_barcode_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/kibagoxopen.pdfIn PDF document text
    • http://famuruvif.epizy.com/amd_driver_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/xunazetisafov.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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 5552 bytes
SHA-256: 80de85ba81fdc830490e0c21eff9ac9d189af92abf2a53e1dab844b925fdfcbe
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 11192 bytes
SHA-256: b60bf88c171252c3f32d28f55ea29e165a053097b31533e0c9a7728ee2d5f740

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