Malicious PDF — malware analysis report

Static analysis result for SHA-256 b386ca82b046970a…

MALICIOUS

PDF

98.1 KB Created: 2021-03-23 19:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4fd49a46f6672bc91f6d2898555f8bcc SHA-1: e50eafa39ea58b43b841edfb7ac31c9957820e63 SHA-256: b386ca82b046970ad9af37bfc9d36524f08e4957a5d5707c9eba6ec1ab0235fb
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs, such as https://lozipotod.ru/strik?utm_term=ap+calculus+optimization+problems+and+solutions+pdf, indicates the file is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://lozipotod.ru/strik?utm_term=ap+calculus+optimization+problems+and+solutions+pdf PDF link annotation
    • http://zarabatyivat.ru/gibuwujufamaxeqgy3.pdfIn PDF document text
    • http://tamasolesodaj.mypressonline.com/different_types_of_bolts.pdfIn PDF document text
    • http://losqutoq.online/robetisugenuzomoruleripolhbqgn.pdfIn PDF document text
    • http://wumewil.sportsontheweb.net/links_awakening_walkthrough_switch_face_shrine.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/general_science_asvab_study_guide.pdfIn PDF document text
    • http://kedamijofulufep.mygamesonline.org/business_management_courses_books.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/vapakumixibatuj.pdfIn PDF document text
    • http://igafnd.org/sims_4_cheats_code4zjmm.pdfIn PDF document text
    • http://nubatevujonuw.mygamesonline.org/ponebu.pdfIn PDF document text
    • http://eglo.club/567226060011oyf8.pdfIn PDF document text
    • https://kirofiwesufeziw.weebly.com/uploads/1/3/4/8/134846910/3916089.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mazizinopuki.rf.gd/juxezepavitenusasadidiku.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/munopibitub.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/62758645475.pdfIn PDF document text
    • http://pemukusa.epizy.com/adani_green_energy_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/87316296477.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001329a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329A 5480 bytes
SHA-256: e155810a1572d9ca1631f48b1bfc6893806ffdef3066adc7082c28a1dc595023
font_01_sfnt_off00014524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14524 2352 bytes
SHA-256: 7bf5df61cd33b9c9c1a1b652008727b55711e21ad1b65ca8453fc323aaa836f4
font_02_sfnt_off00014ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FFC 11920 bytes
SHA-256: 63def051232da1aadc09ca7719889791d603855fd50bbfb9fd18287ee04c0c89

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