Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c7cada15e0ca64…

MALICIOUS

PDF

80.1 KB Created: 2021-09-23 01:35:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d5e3e0e1a326eb75cd6c981b692f4d4b SHA-1: ea99ae4aaabb9903f60a064dd7666785904eb2cb SHA-256: 86c7cada15e0ca64a6f6eadf01cef37bfed0adc1ed2c7714dc21ca7ce0e98d95
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=putlocker+long+way+up PDF link annotation
    • http://mardeestilos.es/fotos/file/mepozakuw.pdfIn PDF document text
    • http://oris-am.com/editor_up/fudemukulewifawigabaru.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/45373974283.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/98889149916.pdfIn PDF document text
    • http://marymo.ru/uploads/files/33025436846.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/23091861902.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/9344237671.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/17413725064.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/dopalotenojas.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/paxujar.pdfIn PDF document text
    • http://safetruck.gr/images/file/gitolo.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/kijazufamenunoz.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/zigin.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/92870439483.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/tefomejusarisafoda.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145745c255a2---32067133022.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dawevifovuruli.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/78495623075.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161318d63822b1---94788625613.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/barokavobom.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/depusutelonusosebidowuwab.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/bugurosukus.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_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 18164 bytes
SHA-256: da6e1639aba9b303c6ed3bda3fd59c3650aa3e19d0befd2151242a07ec8e6fb9
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 10680 bytes
SHA-256: d77ebe280c01d6870817b630a12822952151b2654057959d5abae2172529e62d
font_02_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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