Malicious PDF — malware analysis report

Static analysis result for SHA-256 640d659b45430a23…

MALICIOUS

PDF

76.1 KB Created: 2021-10-10 08:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9fc6ec4714ecfac93a02c05c63e989a8 SHA-1: 09357381c5a0c55022fc6eaaca1ea11829d19ec5 SHA-256: 640d659b45430a23b19da04d0c085c48f5a7ce5bd62b33c8f79beb168b771b8f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is structured as a link farm, indicating an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://coretry.ru/uplcv?utm_term=discuss+value+chain+analysis PDF link annotation
    • http://dom-2000.ru/ckfinder/userfiles/files/72481738322.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/26rm2updgmospimtau33ckuu04/25980338514.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210903032500106.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/33468848797.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/83460137912.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/pizubi.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/sajurofuzitanatag.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/52799550376.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/81554529071.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/javitapoxetezo.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/xijifovojutipobaf.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/nitazufipazomam.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/wesekuzuzi.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/gasukovowarum.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/17214434136.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/83325213209.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210904120146.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c7745b8922f7645d827476008527b85c/sedulabopugenodezo.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/pepedizibumogijiteduj.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/wijekemenabirixonufivivi.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/satasuligopukidapijinaru.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/kevavopefidikezo.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 10292 bytes
SHA-256: 24087ae5b4865d41cf580ecbee6ef5d3046beeb7131f2f58e09fae51e0111de9
font_02_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 16492 bytes
SHA-256: 5e3f0cb6b2d8da9f0ef2c4f4edca72cd49cbe94360ea90a26ab5cbbf7e765d0e

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