Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d13dbac965a780…

MALICIOUS

PDF

72.8 KB Created: 2021-09-29 02:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac70ae0e745f3bd214589c62480be2b3 SHA-1: 28bddfcca62d6d9bb7aa028e3c16e8b6d582a9c3 SHA-256: 71d13dbac965a780d21f8a3ee1c412076aed55732e851d2791e516921fc5bde2
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 embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a probable phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=lies+michael+grant+pdf PDF link annotation
    • http://tz5168.com/uploadfile/image/2021/09/12/file/20210912_162625_158.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/98106675292.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/85300377280.pdfIn PDF document text
    • https://megashina24.ru/files/files/99808031538.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/39295013622.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109162337049166.pdfIn PDF document text
    • http://koddous.com/userfiles/file/mawopividititotazuf.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/87972709916.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/82171146564.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/56626716227.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/98539782124.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161401b9bab4d2---buver.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/77029749718.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/46907026044.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/17300045696.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/kerajizutijulivaluremi.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/57557386613.pdfIn PDF document text
    • https://metagrhyd.com/infopub/pub/file/pofetoveravolovaraviloz.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/tipipepukasafujod.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/luviv.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/katijagokajuvure.pdfIn PDF document text
    • https://sibirprokat.ru/ckfinder/userfiles/files/raninotajejirujan.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/kamewujo.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/51688577607.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_off0000b649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB649 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE60 10904 bytes
SHA-256: c85b1194561493f7686c79c5d851ca74f81025c8e34d17f45bca033c93e81cb4
font_02_sfnt_off0000e72a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 18264 bytes
SHA-256: 85628cf57f8b9b9ed1813276294c8979c2583fe83c459cdf6fd3b6674ca29ea3

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