Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f30bfc7805568f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 03:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d37986e55e25dde69651dc45da5614dd SHA-1: a2fa571545202514ac675e9e9b9afd61561b6148 SHA-256: 09f30bfc7805568fb625b10c766fbe16a3bd40970c2673c7b2e02a44538998be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+visit+private+accounts+on+instagram PDF link annotation
    • http://www.kevimotor-rock.hu/files/files/rovamuwuzekibimidemogu.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/wawevudegalivo.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/45546182582.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/86742912574.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/vepemeripepe.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/dokalaripuveba.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/56920214807.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/72321904383.pdfIn PDF document text
    • http://tencanpowder.com/d/files/tadagekorunawew.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/54117510590.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/23518213220.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/48760460362.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143d0a98151d---9408148801.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/xewazadewegiwusikot.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2b9ba9d7---3026561333.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/wurudaledapa.pdfIn PDF document text
    • http://deshpanday.com/ckfinder/userfiles/files/44312472282.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/15017777817.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/8867496159.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/8815897081.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///nitovutomuzumadobezudivi.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/75960923299.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_off0000d6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EC 10916 bytes
SHA-256: 04d517051932ddc25bf65fd8c570b674a6fcbce67ef9253028473e7822ba750f
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 17324 bytes
SHA-256: c52a19fc97a44ba7202b75db946c2ebe98f86fcd349a4b8a6e13b6b1083d1609