Malicious PDF — malware analysis report

Static analysis result for SHA-256 45340346c19cc781…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 06:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 113f485dc79f0c0cdf1364ac36b9075b SHA-1: f3685db0397b28f89aea0d044a42f37c91d87275 SHA-256: 45340346c19cc781562813e0ec8ad917f93c9bc8fe38921007aa280edf6436c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URLs, many hosted on disposable domains and employing UTM parameters, suggests a phishing or link-farming operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a large number of links on potentially untrusted hosting, reinforcing the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=how+to+configure+android+phone+for+browsing PDF link annotation
    • http://quincy.pl/ckfinder/userfiles/files/19991218920.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/1327589343.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/vaposudedusibopurofukep.pdfIn PDF document text
    • http://full814.com/upload/files/94700273734.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/10823563331.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7812805614.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/47824643872.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/be4836c473f8855a6a94a9462be309a5/zikudekamimonowukimi.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/podawuko.pdfIn PDF document text
    • http://usateatop.com/_upload/files/wizagubif.pdfIn PDF document text
    • https://vleek.com/uploads/files/14964288735.pdfIn PDF document text
    • https://ebooksweb.net/files/file/reweboxulugi.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/56100786504.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/zoxidepawarabotuxilowonum.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/78093681212.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/rosor.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/dekiwunogabobemeza.pdfIn PDF document text
    • https://tessuno.com/upload/files/6142982b6ee8c.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/piloferulodamekufomifax.pdfIn PDF document text
    • http://ministerium.pt/files/67493334091.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/13562290694.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/ramoridara.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/savelasipepipuwezexuvakaj.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/15020863049.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_off0000e602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 17752 bytes
SHA-256: 0b39fde01bab81e792336aa477efcd32013f9d1d0c78ea0fbaf161490779376f
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 11172 bytes
SHA-256: 998305dcc016bf03495788b9646c0c1f682bd7e432206f24c84afb9ccdcb70e9
font_02_sfnt_off00012df7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1