Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a2fbcffa873b13…

MALICIOUS

PDF

74.1 KB Created: 2021-04-24 10:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0cdad86caead3b15feab44e23c4d4e2f SHA-1: 9bf43d8df6aacfe18478cefc4269405045454918 SHA-256: 17a2fbcffa873b1354e1282df221e0c58d07f28623e571c44fde8520ffd8f08f
186 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. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://dugedepap.ru/strik?utm_term=how+do+you+describe+a+greenhouse PDF link annotation
    • http://bunokegezodidur.iblogger.org/english_conversation_lessons_for_adults.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/barron_s_sat_vocabulary_flashcards.pdfIn PDF document text
    • http://wudaxozibutix.sportsontheweb.net/bifomupe.pdfIn PDF document text
    • https://cdn.sqhk.co/tokofape/ajhTii1/cnc_usb_controller_software_arduino.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/nikisaxigewikarikosinive.pdfIn PDF document text
    • http://suwefazimim.medianewsonline.com/38495623702.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/R6F1ihI/hollywood_story_fashion_star_walkthrough.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_ed87c6de6d2b4e8181320b5d40305bde.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_5f9bfafd375248bd8d0bb0f27af12fad.pdf?index=trueIn PDF document text
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_0c2347b2329a44cbbe7b2b4c2f8b7c81.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ed1595-d035-47b2-80b0-660b13e7230c/yale_real_living_yrd210_manual.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_6e23dcd9d43a42ee95dae4cc111dbcf4.pdf?index=trueIn PDF document text
    • http://nifiwirijapokaf.rf.gd/answers_with_joe_shirts.pdfIn PDF document text
    • https://ede36962-9452-4451-b182-fa4236ba9bc6.filesusr.com/ugd/83b1b3_1f981c195a9247b0b52a336e77a3f1a0.pdf?index=trueIn PDF document text
    • https://4e33067b-0f13-4bed-bb9c-ea95f768fd7c.filesusr.com/ugd/23924c_e9b16e8e40e04833a30d603476e7cd19.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79856cc-99f6-454f-aca1-698daf137c3b/weber_grill_restaurant_menu_chicago_il.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_off0000e504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE504 5464 bytes
SHA-256: 741025677e8e65cacdacdf773e8a5812d73e8546b4cc4d3135a29f5e6d3f25a1
font_01_sfnt_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 10864 bytes
SHA-256: 8b887aaf41cb4220c81aa6862ad1b47761075c1be60f60f785ea90f3a58b73f8

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