Malicious PDF — malware analysis report

Static analysis result for SHA-256 4103452329a1d69c…

MALICIOUS

PDF

86.2 KB Created: 2021-02-08 07:10:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0d4734f97b9926380c372cc3e0f66e45 SHA-1: 98e75eccdad142389a37f141a8757cce7064615a SHA-256: 4103452329a1d69c65aa7a56494082f3d7d7d20123ee52d7cb0529dc651196a9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=olympus+om-1+film+manual'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/123?utm_term=olympus+om-1+film+manual In PDF document text
    • https://static.s123-cdn-static.com/uploads/4491152/normal_6006b52859974.pdfIn PDF document text
    • http://alphabitx.com/exploding_box_templates_freej3j60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fd1cde42034d.pdfIn PDF document text
    • http://bcpzonasegur4viabcp.com/new_blob_response._data_type_applicationtzrz8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_6019cb35716ee.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/netinuwa/gangs_of_new_york_movie_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/answered_meaning_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/48519523203.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/performance_of_bargaining_unit_work.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/ampere_apk_google_play.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/vosepalazaxolerobuzoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/63370756664.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/maths_worksheets_year_10_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/answer_42_on_impossible_quiz.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/70582392156.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/cease_and_desist_slander_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/56311838355.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/57393986642.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/loxaludawomupagamareporun.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/zebivotewuwakunogitusase.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_off000111eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EB 5164 bytes
SHA-256: 7598d28b304bfe01aeeabb320513dd7456e0bc18d11e9270921df2fce5dbb00f
font_01_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 12072 bytes
SHA-256: 10931016785544d4d588b8b80b4ec6b0639f15d786e4f27eb100883566ce2fbb

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