Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb85a400ed6098e8…

MALICIOUS

PDF

71.4 KB Created: 2020-11-21 07:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 71e36a01752613cbd2644d750a7b0745 SHA-1: 1b5bfab338f5b663df95effa4b17eda10aff040c SHA-256: eb85a400ed6098e8693575266b0b0b1733cebad8a2d28542c053f120ce18d7dd
154 Risk Score

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/123?utm_term=to+kill+a+mockingbird+ar+test+answers'. This URL is likely used to deliver a malicious payload or phish for credentials. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and the malicious URL suggest an attempt to trick the user into visiting a harmful site, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=to+kill+a+mockingbird+ar+test+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405430/normal_5fa3693b6b3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_5f871fea94e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380086/normal_5fb5c39905aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459914/normal_5fa7a3adf0231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f8c0e23400e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5faa28c0b66dd.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/fekaduvopigab/pocket_style_manual_8th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/bipifipiragamowotufiw.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/hi_lux_optics_warranty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c186a493-3247-4e73-ba7e-f3f84daf08bf/33510214052.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09657d06-7197-49b4-9f33-fd598dc936c6/tabla_de_dureza_de_materiales.pdfIn PDF document text
    • https://s3.amazonaws.com/modowor/ultimate_mortal_kombat_3_move_list_sega.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/xobidedelirovijopisoliwav.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/4l80e_segment_swap_question.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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 5504 bytes
SHA-256: 198cb69e0bbc4ea03172b55b6adcd436137a526e7c80eb112a8a082c31d9dda8
font_01_sfnt_off0000e7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D0 11952 bytes
SHA-256: 65689dcb56d20878461c0bfbd4a5f301db68b94f23a00f009b9c986be5b68cad

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