Malicious PDF — malware analysis report

Static analysis result for SHA-256 771c54add29c97fe…

MALICIOUS

PDF

62.4 KB Created: 2020-12-24 05:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b297db428d1b3da038142c6b606db15e SHA-1: 7369d9e2be08d56795faadb0dfdc2e83bf1fcec4 SHA-256: 771c54add29c97fed597c884bab90b714fe8e02919b0bc2503f4846f109dcd49
126 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating it is likely a phishing lure. It contains numerous external URLs, with one prominent URL pointing to 'trafficel.ru', suggesting an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, appears to contain text related to 'Post it super sticky notes walmart', likely a deceptive pretext to encourage clicks on the embedded links.

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://trafficel.ru/strik?utm_term=post+it+super+sticky+notes+walmart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f89c39008e0f.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/je4oRig/netoledujufedigimowa.pdfIn PDF document text
    • https://bisigategisabuv.weebly.com/uploads/1/3/4/8/134884720/1124553.pdfIn PDF document text
    • https://cdn.sqhk.co/weteroliwo/Djheeiw/truck_racing_driver_truck_simulator_2.pdfIn PDF document text
    • https://livozuduk.weebly.com/uploads/1/3/4/5/134583284/juwoxalim.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/5827050.pdfIn PDF document text
    • https://giwuvapelefawi.weebly.com/uploads/1/3/4/8/134869604/9376041.pdfIn PDF document text
    • https://bemazinava.weebly.com/uploads/1/3/4/8/134890863/6111666.pdfIn PDF document text
    • https://wixozini.weebly.com/uploads/1/3/4/3/134383912/7c0940060fcbd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5fabf4e632418.pdfIn PDF document text
    • https://saxesejidor.weebly.com/uploads/1/3/4/6/134694827/ledelug_wureludebiz_tegag.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/sugaguxagu/bsc_1_year_chemistry_notes_in.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/study_of_periodic_table.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/calisthenics_workout_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/xomipoxavarenuxevigap.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/belle_plaine_high_school_address.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_off0000b39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 5340 bytes
SHA-256: f5bb1a5eae0ed85281abd8c072434f3b360eed59f60a6e07c675820e2ca9ceb3
font_01_sfnt_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 10876 bytes
SHA-256: 93090a472d7d600f17d3f35cf844ba2c87931d3ed1ad68f31eacd823548d349a

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