Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1ccf7144f2714d…

MALICIOUS

PDF

76.0 KB Created: 2021-04-02 08:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: f2f55aee157676ef2cdbe86961ea6b4e SHA-1: 9424e4c0dafc10286fb7faf6e621d7872afca971 SHA-256: 4f1ccf7144f2714d268fe27e104b62439ce148d05fbb58e14f5b5ec6e7016b3b
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a tactic to distribute malicious content or phish for information. The document body, though heavily obfuscated, contains keywords related to 'free download' and academic subjects, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://baarspo.ru/award?keyword=bsc+agriculture+entrance+exam+books+pdf+free+download PDF link annotation
    • https://dizavobezovedup.weebly.com/uploads/1/3/5/3/135313146/84821.pdfIn PDF document text
    • http://zegobudipaju.mywebcommunity.org/ndt_level_3_basic_questions_and_answers.pdfIn PDF document text
    • https://zaloposigino.weebly.com/uploads/1/3/0/7/130739621/nuwag.pdfIn PDF document text
    • https://famunekagazata.weebly.com/uploads/1/3/4/4/134463602/6830709.pdfIn PDF document text
    • https://cdn.sqhk.co/xanikadir/bAjcIif/xuzewedefijubukuxa.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/where_is_the_alternator_on_a_2001_ford_focus.pdfIn PDF document text
    • https://pidilamobojuri.weebly.com/uploads/1/3/5/3/135310388/doxozuzilazi_pamezadidusasik.pdfIn PDF document text
    • https://cdn.sqhk.co/worupageke/gdif4M5/homeroom_classroom_signs.pdfIn PDF document text
    • https://cdn.sqhk.co/lusoxepero/hIXkQnE/fuxeju.pdfIn PDF document text
    • http://magefaro.22web.org/rapovizevitimoga.pdfIn PDF document text
    • http://jegajini.iblogger.org/broken_vessels_piano_sheet_music_free.pdfIn PDF document text
    • https://kimimidinom.weebly.com/uploads/1/3/1/4/131453749/9381584.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/28896255237.pdfIn PDF document text
    • https://cdn.sqhk.co/fufigavaki/hfibvUr/gepasom.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/werowibovezoje/filmora_9_crack_32_bit.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/talk_like_ted_by_carmine_gallo.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/slackware_iso_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7559926c-fabc-43a2-9d35-703a36b030d7/45773494627.pdfIn PDF document text
    • http://najejofimepesef.epizy.com/stanley_fatmax_1000_peak_amp_power_station_stores.pdfIn PDF document text
    • http://tuzuxutetug.atwebpages.com/rokavavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/648239e5-ce07-431b-9e32-74726ef9c089/fazos.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/shakespeare_sonnet_analysis_106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f557c35-f435-42b1-acf3-28fda02515b0/jessie_j_singer_2018_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/99297496506.pdfIn PDF document text
    • http://buwaveb.rf.gd/introduction_to_frustrated_magnetism.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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 5888 bytes
SHA-256: 120346630eea01e88184f76503575eacf20c13e3491ce92afe48a709ccfe870c
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 11196 bytes
SHA-256: ceff25dd6daeb76d7b48ee310724a68ca4f51966c9f8d051c51cc88eb96abdfb

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