Malicious PDF — malware analysis report

Static analysis result for SHA-256 d540ac85533258fe…

MALICIOUS

PDF

75.0 KB Created: 2021-03-06 05:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f8be76ba73860ccb524260f50d1672de SHA-1: bf28e713650e5b42bce599df0863d9c21f3b7c3b SHA-256: d540ac85533258fe9cfde3139eb8c1f33d583a3d8acf08ecc27ea8de2c9f372a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the final destination through multiple redirects and link farms.

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://crophysi.ru/strik?utm_term=how+to+do+neuro+checks PDF link annotation
    • https://cdn.sqhk.co/veletafi/98ihjhO/capsicum_extract_in_eyes.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/nimitukubikota.pdfIn PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/7043683.pdfIn PDF document text
    • https://pubabugolutaj.weebly.com/uploads/1/3/2/6/132680974/033c2ae39ec.pdfIn PDF document text
    • https://cdn.sqhk.co/naxaroja/j268Gqu/pumpy_s_world_2_super_jungle_adventure.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/ibQEhhc/zumizuluvonufedijo.pdfIn PDF document text
    • http://tiledevaw.22web.org/roomba_550_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/Q1id5ia/nekuzusotuvotulikedilazos.pdfIn PDF document text
    • http://ganexofom.iblogger.org/the_revolution_starts_at_home.pdfIn PDF document text
    • https://vopobibipudo.weebly.com/uploads/1/3/4/6/134620476/5344308.pdfIn PDF document text
    • https://fuluposusiziz.weebly.com/uploads/1/3/5/3/135321682/222f8fd973.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/bajapovogam/what_is_the_message_of_we_wear_the_mask.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dde5cafe-424e-423c-8913-176ef274a440/kazezosebibafazegujifefug.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/guide_de_pose_cuisine_ikea.pdfIn PDF document text
    • http://gelanuvefod.epizy.com/check_if_character_in_string_is_uppercase_python.pdfIn PDF document text
    • http://resukiluzuw.epizy.com/dibup.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/wrist_stretching_and_strengthening_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df710dae-f1d4-4b4e-b3d7-1e9dd26cde5c/soccer_training_drills_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/ap_polytechnic_lecturers_notification_2019.pdfIn PDF document text
    • http://wogokafen.epizy.com/74552648752.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_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 4900 bytes
SHA-256: 7d57e5de03f1d2b242500d71e9275af0bd662103c1c0de1d1ca5af6a21d0cc7a
font_01_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 10292 bytes
SHA-256: a92752d5a8938b1d21b2112528ae59c19724a6e2c2de424cc4f1ebaf65d992cb

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