Malicious PDF — malware analysis report

Static analysis result for SHA-256 15da05e6665ef8e6…

MALICIOUS

PDF

85.1 KB Created: 2021-03-23 16:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c4eac9cc2347bda5c7bda2ae59314a03 SHA-1: 7b5c37c4e5294fd95db48f230854520d29b027e6 SHA-256: 15da05e6665ef8e615d1798fbc9f924308652cfef133246b7da944c07725be8d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'bologen.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to relate to printer advertisements, suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://bologen.ru/strik?utm_term=hp+officejet+h470+mobile+printer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5fd21e9d6b750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448985/normal_5fcbb2b527cf8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490116/normal_60366a3834156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_60405d55afde1.pdfIn PDF document text
    • http://sagunutu.medianewsonline.com/65711622636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485165/normal_60397c01a2623.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452837/normal_5fde11c3e5d4f.pdfIn PDF document text
    • http://fupemagis.mywebcommunity.org/class_10_biology_chapter_3_notes.pdfIn PDF document text
    • http://mybestchan.online/penapigosetowikujawopangdhp.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/nodojojowuputofoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_602432dcbca35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424378/normal_60485b8c4c4fa.pdfIn PDF document text
    • http://verenica.net/juzotevosojuwar5qh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/786c812c-6d0c-4617-b62e-dfcabd51725e/60061738405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8d34b0f-cd96-4f5e-9c6c-2f5f502f9f9e/5_paragraph_opord_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3967bcd-f4e7-4543-8a85-a2f09dcbd604/4_pics_one_word_level_2611.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef74032-25af-4114-8d74-edf2f1e30c30/how_to_repair_rust_on_a_jeep_wrangler.pdfIn PDF document text
    • http://gakilasefit.myartsonline.com/balto_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46739257-00f0-4392-b2a5-bc65c22123b6/solving_two_step_equations_1_worksheet_answers.pdfIn PDF document text
    • http://madigekole.onlinewebshop.net/apology_socrates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e7cc64-85c8-414a-967a-615cf3ae017f/62264258957.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_off00010f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3B 5356 bytes
SHA-256: f1e28f24841770ddf0fd56ed42d2fe6d92726ce5dc731410992465b56bba97eb
font_01_sfnt_off0001215e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215E 11320 bytes
SHA-256: 8adf94d59d40f47d83a0bc3bd3f57cb7600d8bd96e92dbb1d031042c2737a5e6

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