Malicious PDF — malware analysis report

Static analysis result for SHA-256 27420a1623f61325…

MALICIOUS

PDF

71.9 KB Created: 2020-12-24 20:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c4bb28d105e8190f051e7d7a5c51e203 SHA-1: ce92009c622d3288c6eda7bdc6d985b3fcc38391 SHA-256: 27420a1623f61325c37cff3b5cc548f22cc20e2e32ef3b984e2810e2af12344d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious PDF designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://trafficel.ru/aws?utm_term=handlebars.+js+template+example PDF link annotation
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/da4cc67858cd55.pdfIn PDF document text
    • https://sudewivevumofe.weebly.com/uploads/1/3/4/0/134042571/zagitupawa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_5f9c3aad74522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5f9e7ac24dd3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5f8a956423b6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5f9d906699b5d.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/viboxikuz/christian_songs_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/fajedalikak.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/ffxiv_anima_weapon_light_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/def450be-3b8f-4702-bf74-6ba2c6bb0a65/balancing_chemical_equations_algebra.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 5380 bytes
SHA-256: 41dbbe6377637d479ee87f2b7737733e12e56e8bbc5c43005c740936cb7478f0
font_01_sfnt_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 6520 bytes
SHA-256: 48f44e4c1c2da3be2d943891bf40b765aae2c48e24faa1b44da4d2768dd68c91
font_02_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 11604 bytes
SHA-256: 42b16172e829aca08f520bf28d469cc5a41541dbe3764f88e1b392638dbabae1

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