Malicious PDF — malware analysis report

Static analysis result for SHA-256 3957910654278b82…

MALICIOUS

PDF

173.2 KB Created: 2021-01-10 18:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6e9519164b1105fc8b184adb09c58844 SHA-1: 2c89a3c681e38b222db7b592e7d6132a99312719 SHA-256: 3957910654278b821e35e0a7244cdb49614d50843d7653cbb4d02a17cd0a6cd1
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://cctraff.ru/aws?utm_term=adrenal+insufficiency+treatment+guideline'. This URL is the primary indicator of malicious intent, suggesting a phishing or malware delivery attempt. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence for a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cctraff.ru/aws?utm_term=adrenal+insufficiency+treatment+guideline In PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/petamuzetiduvigukubamigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5f8ef0ad18470.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/pupodiduvokopamixukiz.pdfIn PDF document text
    • https://site-1167954.mozfiles.com/files/1167954/canada_simulator_2_close_to_call.pdfIn PDF document text
    • https://site-1178548.mozfiles.com/files/1178548/80616571049.pdfIn PDF document text
    • https://site-1177290.mozfiles.com/files/1177290/40612733594.pdfIn PDF document text
    • https://site-1168096.mozfiles.com/files/1168096/ghost_vs_pacman.pdfIn PDF document text
    • https://site-1083673.mozfiles.com/files/1083673/factors_of_production_in_agriculture.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fb72ee37044e.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/gixirojozogufux/rixifirikoluki.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/pitepitaxizo.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/32262299135.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/dosiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/bepukuba/god_of_war_new_game_plus.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002529e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2529E 5432 bytes
SHA-256: d747fe1de91af44aa56dfe0e82d0f74f610034a2151dfd3d48f648a1a789bcad
font_01_sfnt_off0002650e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2650E 13212 bytes
SHA-256: 2bdf9ad62579ae6b989c452109677326c4dcb37f731624bb3af16033f8e192b1
font_02_sfnt_off000290aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x290AA 16388 bytes
SHA-256: b790a3c4f860f4f9538cf038cde388395d2ab04003f139f5fa9b5f0395eb24b3

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