Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a20fc24fcc876dc…

MALICIOUS

PDF

71.6 KB Created: 2021-02-23 01:31:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e22da9817f0e94c9144e6702a6e8c54e SHA-1: b60271f03b314be7c1c6f1a9b4bb3631ea8424b0 SHA-256: 1a20fc24fcc876dc4f05f9b1255b7414455a80c7e5818c69905041c2c19c9ec6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple external URLs, one of which is a redirector for a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

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://maypoin.ru/strik?utm_term=interior+design+course+melbourne+australia PDF link annotation
    • http://vienvozvrat.site/dijotiwixujamu1ns92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467573/normal_5fdeba93a13d0.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/fjdiihi/times_square_ball_drop_2020_replay.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/detegemirafawesef.pdfIn PDF document text
    • http://tradestaroffice.com/teorema_de_bayes_estadisticakyyss.pdfIn PDF document text
    • https://xizovetezewo.weebly.com/uploads/1/3/2/8/132814166/ramefopaporolaw-zesavunizol-ligepu-xulojipili.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/Dhhifgv/beer_pong_rules_two_balls_one_cup.pdfIn PDF document text
    • https://ginuwawabesinu.weebly.com/uploads/1/3/1/1/131164414/ruvogomidenadasazev.pdfIn PDF document text
    • https://cdn.sqhk.co/woxemumi/agejeR8/crossing_swords_cast_sprinkles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gejofizax.rf.gd/log_tables_maths_ireland.pdfIn PDF document text
    • http://bikutuvuxaxixo.epizy.com/25427249827.pdfIn PDF document text
    • http://bulexaresozo.rf.gd/45053657744.pdfIn PDF document text
    • http://tojozolatenizum.epizy.com/igloo_premium_water_cooler_dispenser_with_ice_maker_reviews.pdfIn PDF document text
    • http://kifagugurubox.rf.gd/vutegutivuzekesedixo.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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 5336 bytes
SHA-256: 63653f4bc5631aff2e523f8bc9b146681ae94f1a1f6844049519e9510223372c
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 10212 bytes
SHA-256: fb326036b999ff1c48ac59395ddda6e51013a58261e16f7cb1ea9dd19310f6f4

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