Malicious PDF — malware analysis report

Static analysis result for SHA-256 917e5ddeeb73498a…

MALICIOUS

PDF

67.8 KB Created: 2020-12-16 05:33:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dd6543ead3cef4912f7a6fc119a0c599 SHA-1: 1231adf14cc50318cf819dbd6c825b1afce486b4 SHA-256: 917e5ddeeb73498a6cf0b544f81a7bd797cabbc54f3e50cbdc5582b225456cf4
174 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. It uses a callback-phone (TOAD) lure. 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 0.9998

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/strik?utm_term=cpp+financial+aid In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481516/normal_5fbb8b1584619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5fcc9aa32446f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fd6ccb4e105f.pdfIn PDF document text
    • https://weginufakitin.weebly.com/uploads/1/3/4/8/134846544/4550860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457000/normal_5fc249535a390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476445/normal_5fd95b0bd8af0.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/zifozujiwi/rgp_fitting_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/ucsd_cse_course_schedule.pdfIn PDF document text
    • https://s3.amazonaws.com/popagexexoza/football_head_soccer_world_cup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ffaacb1-f404-4c97-9b47-c1f32fe03d5b/wicking_raised_garden_bed_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/realidades_1_capitulo_3a_answers_page_54.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d5cd920-4759-4eb4-89d7-42d8638a28b6/skeleton_creek_phantom_room_passwords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f135bc1b-6d47-460c-8628-1d5f136676fd/olympian_wave_3_fuel_consumption.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/624ff343-9d19-4b3a-9a33-9b9039021d41/sedojudumepidadideselu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12867858-814c-4ee4-a9c8-ff9d9cb4414b/the_stone_breakers_art.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_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 4780 bytes
SHA-256: 7065172637bbafd378183c32f834eac9ffdd9bdb3dfde3e0bfa19b21f35c2064
font_01_sfnt_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 10668 bytes
SHA-256: e90e0086ec2a38051e527ef1b39e0f753bfb4551bd386e74fed69a656539a213

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