Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea6c3df907c9540…

MALICIOUS

PDF

43.6 KB Created: 2020-11-07 03:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e628cb6cc2ba3f506ee69669209d13f4 SHA-1: bdb7849997af62dff923e6af2e5881be86f2450a SHA-256: 3ea6c3df907c95402b2b4a8b9283b745c2b1c9f0b0e46a4a7eec1ee34dce319b
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a large number of external links, suggesting a link farm or SEO poisoning attack. One of the embedded links, https://traffnew.ru/123?keyword=cladogram+answer+key, is directly associated with the document's apparent theme of a 'Cladogram answer key'. The PDF structure itself contains embedded JavaScript, which is likely used to facilitate the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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://traffnew.ru/123?keyword=cladogram+answer+key PDF link annotation
    • https://laguvibokabab.weebly.com/uploads/1/3/4/3/134383318/417ee7032daef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372740/normal_5f8eff11cb693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f9cdee6f2b85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f9649ab8088b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_5f97546cc177f.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/lubufunegova_pofev_jirawavunilo_nujuvubinova.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_5f9883341893f.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/pomaxa/lithiase_de_la_vsicule_biliaire.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/italian_citizenship_jure_sanguinis_help.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/surah_baqarah_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/overnight_lean_keto_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/safutozemimejituzidofara.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/pewija.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/is_mary_had_a_little_lamb_a_christian_song.pdfIn PDF document text
    • https://wamefopoguvo.files.wordpress.com/2020/11/45394473402.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_off00006d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D59 5308 bytes
SHA-256: a13dffc6e4e64fcca08ff42e6c343ec2c7eb5792e0e0ca7ce8f2eb17f050ec90
font_01_sfnt_off00007f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F6B 10264 bytes
SHA-256: 4d926a446e8eba5fbc6f363e9b74969fbc587d28bd50c537393873ddacb9f569

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