Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c13ccc1e7b4a58a…

MALICIOUS

PDF

75.9 KB Created: 2021-03-19 07:52:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: dffea6ed5a10e0f7d52110e593beaadc SHA-1: 5b40ff47add4a019fa2f4e06f173f2ad9543231d SHA-256: 3c13ccc1e7b4a58aab702ded3631874fd45b515b869198b037afc745e7f4fee1
166 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or redirection attempt. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's content is designed to trick users into believing there are new or changed banking instructions. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score point towards malicious intent, likely for credential harvesting or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://resalured.ru/strik?utm_term=the+spectacular+now+netflix+australia PDF link annotation
    • http://netzamka.ru/buruxiwi26t6i.pdfIn PDF document text
    • http://snapchat-alert.com/vusulod1ml49.pdfIn PDF document text
    • http://cenderaoriginator.com/how_to_check_sap_exchange_ratejx3c3.pdfIn PDF document text
    • http://filanion.online/1745554046v4ntr.pdfIn PDF document text
    • http://trysucre.pro/chuck_season_1-_5_free3l0kj.pdfIn PDF document text
    • http://edaruzal.xyz/romibuzis4z1cz.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/aicgiib/bewawafulaximumoworewen.pdfIn PDF document text
    • http://idem-peshkom.ru/27840738524324aa.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/vonuxufemer.pdfIn PDF document text
    • http://getbuiss.online/maweponqb3l.pdfIn PDF document text
    • https://cdn.sqhk.co/kozutani/7hfaKaQ/whatsapp_gb_apk_free.pdfIn PDF document text
    • http://uorott.com/bulizadomunaliqx684.pdfIn PDF document text
    • http://tozaworewinox.mywebcommunity.org/blades_in_the_dark_rules.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/mens_air_force_1_low_white_size_9.5.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/mRiaMgd/11.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/devuxuzejozam/bcci_ka_full_form_bataye.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/wenalemodu.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/24299247379.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_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 5212 bytes
SHA-256: 1dee27ae9e485017972e03c63241374b111526c13e57f45ff6211a41864b54f2
font_01_sfnt_off0000fb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 11172 bytes
SHA-256: a505c645d0fc2e0a8366c189613cc4c6f1d998b621cbcf11c8ce8ce830b228af

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