Malicious PDF — malware analysis report

Static analysis result for SHA-256 844eab2d3bc8f90a…

MALICIOUS

PDF

75.7 KB Created: 2021-03-30 05:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 3992e3257dfc4bd26f38df4441df22c8 SHA-1: b41255e21a174c726a5eaf2ec02a63d7f57c1199 SHA-256: 844eab2d3bc8f90a8bf8284e13092807bf316aa2b5915d4c370c4c55a86cdad9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. The document body, though heavily garbled, contains text related to 'school uniforms', likely a lure to attract clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=why+students+wear+school+uniforms PDF link annotation
    • http://gusevoxuzuwelap.mywebcommunity.org/xamojalajibekipudisuzuw.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/reading_a_metric_ruler_worksheet.pdfIn PDF document text
    • http://xitodefigatefuj.medianewsonline.com/boston_airport_map.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/ifIRgiU/64600741120.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/f3mkhfV/25307112496.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/ggg3QZy/dji_drone_remote_controller.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todetizos.epizy.com/statistical_inference_for_engineers_and_data_scientists.pdfIn PDF document text
    • http://fosekor.epizy.com/90243016230.pdfIn PDF document text
    • http://sijozorugepidu.epizy.com/89608798288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58beb311-be28-47fc-a197-d26534908fed/best_fly_tying_materials_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/380c1bb7-1785-4463-9233-56a034571f01/mankiw_principles_of_economics_quick_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a93125-25f9-4c71-833f-24255929ebb2/death_note_characters_l_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/672560ed-e849-4c53-9bf1-7412343603c2/xodejonep.pdfIn PDF document text
    • http://wamodaf.epizy.com/automated_water_irrigation_system_project.pdfIn PDF document text
    • http://gekeweluzal.epizy.com/18926289548.pdfIn PDF document text
    • http://xijewixevav.onlinewebshop.net/line_6_spider_v_30_amp_models.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/pisotori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd719e23-6dcc-480a-bb4a-1c0177a282cf/spanish_word_frequency_dictionary.pdfIn PDF document text
    • http://vutaxinasiva.epizy.com/kafexoladubomejibusebuji.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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 5468 bytes
SHA-256: b84570743c626da2b9179f653ab47bd0eb00c467a898deeddfe2f7279a6fcc1a
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 10564 bytes
SHA-256: 9fa976c0fbf62f99fb1c8b40dddc7802784560dd11653dd27ce0c3d6624af2d0

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