Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57c8c9363e6ef34…

MALICIOUS

PDF

69.2 KB Created: 2020-11-11 04:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 091b166896a69c019d3c6d3b4bdbb40e SHA-1: d49ef05759361c06839a802cde3cfcd1a9c94480 SHA-256: b57c8c9363e6ef343950ff8eef0228a78521a2ec064730f8d8baadb432e5144a
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URL, 'https://ggtraff.ru/strik?keyword=physics+lab+manual+loyd+3rd+edition+pdf', is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

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://ggtraff.ru/strik?keyword=physics+lab+manual+loyd+3rd+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f8da2909a719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381738/normal_5f95e9ee5ac99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420587/normal_5faa3e916cb3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369916/normal_5fa2036757cfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366627/normal_5f889049c4530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391893/normal_5f922cbf5aaa8.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/bejeseja/81794758454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43db4a7b-1230-4947-939e-675a0e47709a/8637036744.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/87528625025.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/beneficial_microorganisms.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/xetupezovakidawinugije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0337386-608b-4d11-a50c-e696658f066c/6226152530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0262b0b-4a8c-4103-ac08-534e335101e1/bryant_plus_90i_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf582f2d-5b37-4cad-97b2-ca3115fcc3ea/manual_for_spiritual_warfare.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_off0000aff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF9 5800 bytes
SHA-256: 08c28f1429b389f86da1366001c419187f5abb936d3a4d041420935c35cdee88
font_01_sfnt_off0000c394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC394 8384 bytes
SHA-256: d58abb8b177161a6b057fb3a866b73193ad9512b8b227611f60f718115468391
font_02_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 22324 bytes
SHA-256: cc4337d6bbcee6da06c3037ef96e8e6de81d5b4536970eccf86606ab7a4061bd

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