Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae14664bb5b669b…

MALICIOUS

PDF

77.0 KB Created: 2021-05-17 03:52:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c78ebfbb5aa7c30403936cef91b84c80 SHA-1: 26dccddc28d174ff3f18fc44f0868dbf3f62a6b5 SHA-256: 3ae14664bb5b669beef3f9b0b151d335c8d04f5ceb78aaac586cb539e5f66b2f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or file-sharing services, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to technical support, aiming to trick users into clicking malicious links.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=how+do+i+set+my+suddenlink+remote+to+my+tv PDF link annotation
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/cf0828b.pdfIn PDF document text
    • https://tovunebutulewe.weebly.com/uploads/1/3/1/8/131871744/4508853.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/khhoqZY/batizamuderupel.pdfIn PDF document text
    • https://cdn.sqhk.co/ravuviwidi/is4vsgd/ludo_king_mod_apk_dice_control.pdfIn PDF document text
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/xufolubabezilave.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/visezezovozeposi.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/asme_section_viii_division_1_radiography_acceptance_criteria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427526/normal_603924305ba72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469852/normal_6011a575d2a30.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/osaka_sightseeing_map.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/jbjEjgV/spider_solitaire_online_247.pdfIn PDF document text
    • https://kotevopokevunab.weebly.com/uploads/1/3/4/5/134590751/3a6a7764bf2.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/zatasipezeg/6872699340.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/dbt_radical_acceptance_coping_statements.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/biology_2_grade_12.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/best_website_for_booking_accommodation.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/56202482202.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/67542406131.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/romeo_and_juliet_act_1_summary_worksheet.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_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 5040 bytes
SHA-256: 8613d50f5e4cb2c64a70dc2f1a7678bc0d4d3adb6aa2a282b1e94cae9df9d4d2
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 10772 bytes
SHA-256: ec70567c2af5bc2b5f5e0c9cd36edbe8183ad10cb7c867966bf940dc328d9973

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