Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e3ca87f08f2e15…

MALICIOUS

PDF

58.2 KB Created: 2020-11-14 00:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: cb85c7dc76a486922bf8d3b83afbdb05 SHA-1: d9cf90451fd3e8af52e281f0a17d3f9e24698c12 SHA-256: a4e3ca87f08f2e1523f588bbb28766672e0cab5d83847ec9f5813b81bd2080ae
154 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 routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 4

  • 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.
  • 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=assalamualaikum+baby+voice+ringtone In PDF document text
    • https://cdn-cms.f-static.net/uploads/4443803/normal_5fae0a1cd9f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366357/normal_5f96807484c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5f9fc1ccb3e1a.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/zemigiduwagafu/long_vowel_sounds_worksheets_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/zitaxotomolunozoxa.pdfIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/zaviwomudakij.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/frequent_oater_character_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/sekugudimav.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/mewabogogesewamenelitam.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_off0000aa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA34 5472 bytes
SHA-256: f8ce5d63249cceb39f06f5139a94bea83ea3311d2f8247eede50a22a64e72b68
font_01_sfnt_off0000bccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCF 9236 bytes
SHA-256: 637e850793b05bd1dbcc9f753f9e3f99cf082a48b1b973b2e4f1257edb893122

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