Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1592d63ad13bf71…

MALICIOUS

PDF

81.0 KB Created: 2021-02-27 02:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 019468c3cc90499f5c07567011ed1b5b SHA-1: cef51c1cf0caba9ed86ed731cad4c49418f6a7d0 SHA-256: d1592d63ad13bf71b7299fbe4af76b5c3c76ec9680c9da70c9c331bb8bfcae1c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics point towards the document being used to redirect users to malicious sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=program+management+office+structure+ppt PDF link annotation
    • http://zugasanuko.getenjoyment.net/whats_the_difference_between_joy_and_happiness_in_the_bible.pdfIn PDF document text
    • http://form-lnstagramcopyrightservices.com/wefawilipozotadeq0o.pdfIn PDF document text
    • http://uose.xyz/fodepumuxutiwotoraduzks73c.pdfIn PDF document text
    • http://clebohets.xyz/simuzubediwini4ln2d.pdfIn PDF document text
    • https://gatuniku.weebly.com/uploads/1/3/4/0/134097356/mewanulewafawivo.pdfIn PDF document text
    • http://center-san.ru/schools_that_offer_interior_design_in_philippinesfkdmt.pdfIn PDF document text
    • https://rajagoka.weebly.com/uploads/1/3/1/4/131406288/2945617.pdfIn PDF document text
    • https://cdn.sqhk.co/kizafizutuw/fH7chjM/85814399828.pdfIn PDF document text
    • https://cdn.sqhk.co/bofagenined/hefgdhd/96340149013.pdfIn PDF document text
    • https://cdn.sqhk.co/vilevefe/nngdHii/22365968132.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/pXEhfge/tikofusokeredubovos.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/bizanutafud.pdfIn PDF document text
    • https://temonobulap.weebly.com/uploads/1/3/4/5/134592988/sajofelakobaful-fidiw.pdfIn PDF document text
    • https://cdn.sqhk.co/sunawopi/QCijJVo/wedding_cake_prices_and_pictures_philippines.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402478/normal_5fdfdfaa7c1fe.pdfIn PDF document text
    • http://dazolovegom.mygamesonline.org/what_is_the_magnitude_of_the_net_force_on_the_first_wire_in_figure_1.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://resilasijajatil.myartsonline.com/how_to_rig_a_live_bait_for_bass.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/xefagoredexewetiviga.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_off0000f5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AE 1604 bytes
SHA-256: 18d931a2f080643bd6688de9325a04845868c669c69a24602c3af67a7cd8eff6
font_01_sfnt_off0000fdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD6 5304 bytes
SHA-256: 91d48dc71ef4514ee0f99e4de2a387a7db8071e65ec1bdb5d54d71676b438359
font_02_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 11236 bytes
SHA-256: 3c0bab31af064ef06228376f980e69633c1ea6de3734a2f66e27bc896556c881

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