Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f3d7226f58ed75…

MALICIOUS

PDF

73.0 KB Created: 2021-03-13 21:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 306759e48acf6edc10cac2ca7e629f6d SHA-1: 9caf5b43c01b1bb708738e6013ede12bf0168e15 SHA-256: 28f3d7226f58ed75db44f124491cbe4bd3eb04fda614aba27f9658e5357ace0b
116 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 embeds external URLs that direct users to attacker-controlled resources. 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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/wix?keyword=northampton+county+register+of+deeds+pa PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366031/normal_604a13005665c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445119/normal_6015adb1ea2e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_6013b3852c414.pdfIn PDF document text
    • http://jelusuvobirolen.mywebcommunity.org/11089258626.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/lusabifef/71552605900.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/plague_inc_premium_apk_1._16._1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7811fc-3102-4ae9-bcd4-f9e943ae9c4e/how_much_does_starbucks_pay_in_california_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71af3355-dd2e-4fdb-a2b5-3f6b017f28b6/77268469091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/858c3cae-13ef-45e8-a986-5b162ddd87e1/85083382811.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37949cab-7fb9-4814-ba6c-a201b912ca0c/14099335158.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/70555985438.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/ethiopia_reporter_amharic_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899ff62e-ca0c-440b-a119-2fd17e2ac02a/25522359650.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/zumitozofiluro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aade74c2-d6f4-4cfe-b793-52bffa8bb63b/importance_of_non_conventional_energy_sources_in_the_context_of_global_warming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/139eee68-7f5c-45d5-9a86-ff63b4fee95f/dikokuko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5526e72-be51-43b8-a0ea-2b146a6e653b/16743009664.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFE 5608 bytes
SHA-256: b762dc7c5956071b7ec8b9bf42b1e54a4133cb1c62c59bf86ccf2da601a64b23
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 11156 bytes
SHA-256: e01a6aaa87a0e289085b46a2e792fe1a220f0cabaa6f3461d8c1622a9072f01e

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