Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d5d78a3e154b90…

MALICIOUS

PDF

69.7 KB Created: 2020-12-24 19:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5b72b01fd83873a63a5a23a099c3b280 SHA-1: 93aa0112627fd2cfaf75abe0c63da009b2491e6d SHA-256: c5d5d78a3e154b90ca1e53c23839e1160cdbc5a17612f944d52e57aed8cfb4e7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/aws?utm_term=organizational+behaviour+and+management+martin+fellenz+pdf'. This URL is also listed as an embedded URL. The ML classifier and ClamAV also flagged this file as malicious. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its content, but the presence of a malicious redirector strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/aws?utm_term=organizational+behaviour+and+management+martin+fellenz+pdf In PDF document text
    • https://cdn.sqhk.co/lisutovudaf/SBaMt9K/81411268645.pdfIn PDF document text
    • https://cdn.sqhk.co/retirijozi/gdDjx2G/rewibule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467586/normal_5fbe3fb8ae8e5.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/RBeWoSL/algebra_1_final_exam_practice_test.pdfIn PDF document text
    • https://cdn.sqhk.co/forokuxodel/HsaB7jh/cancel_bet_plus_subscription_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/geRjdia/castlestorm_2_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/jdgdjht/64416542263.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/fijhigg/64897852396.pdfIn PDF document text
    • https://cdn.sqhk.co/fojufifef/gjicw2j/56154911810.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/susopuzupure/appsc_previous_question_papers.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/ccsp_official_study_guide_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/ranarevepodipisugavitezi.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/bts_songs_idol.pdfIn PDF document text
    • https://s3.amazonaws.com/tobaziw/satyanweshi_byomkesh_2019_movie.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_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 5556 bytes
SHA-256: c42b6ac2f1c4a7bc22bd072b5e951891ea459cad4b26a1c2b338651de25c260b
font_01_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 10164 bytes
SHA-256: 72635e222ba8a786025983dfbe7d2dc700e6472a56c4d8d60a479a0816ff5b36

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