Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2d712eaf3a9115…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 05:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf6a7a26f362d6b1e1f309471844f5d9 SHA-1: 041810f6b5f8c53f97e2f55e9b81e7abff0edc5d SHA-256: ae2d712eaf3a911565b465c1ad5547fea52a227ebec604e834e32691950b64ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicating a link farm or phishing lure. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest the intent is to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=comic+template+generator PDF link annotation
    • https://chasehr.in/userfiles/file/48507863602.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406a4d1e2e1---bikomumefowafujulak.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/bufiwebufawutit.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/runaxigubetenuta.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/53890826088.pdfIn PDF document text
    • http://trevorhannant.com/41196337134.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/doboxujepezizesarisodo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/43f780feec317551d8321d1cd0eb3c75/jolimijogibujavuzijuz.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/zitekobarivefibuzivasumux.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/75598897453.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/5503951732.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/dujazutazidadowu.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/mezofuvog.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/69270211209.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/20781689544.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/duzizesinidinefitani.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/58295677956.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/23329542885.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/87795586347.pdfIn PDF document text
    • http://gibisch.biz/files/files/tovesafepibuja.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/rerugufuvezodofonuzofod.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/55594382269.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/43551601877.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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 10580 bytes
SHA-256: 8dcebb742761dfeadb4300c0c5301521b4c66dc531251edd5d8f1c7b433bc251
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 17892 bytes
SHA-256: 1907e66ef3f9985ed650a5a03877877ba3e80d5d012bb33a2999b677d2405e32

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