Malicious PDF — malware analysis report

Static analysis result for SHA-256 c909b02bc2bab2c3…

MALICIOUS

PDF

77.8 KB Created: 2021-09-22 16:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a88dddea61f3412e45c248a6e747ef5b SHA-1: 224f69be10191878daeb8516833cbbb8c5327e31 SHA-256: c909b02bc2bab2c3c5032dc86f2961de07fbc8d2de9d4d9dac85072f1a2594f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack. Although no scripts were explicitly extracted, the PDF structure and heuristic firings are consistent with malicious PDFs designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=where+is+gboard+on+android PDF link annotation
    • https://istanajp2.com/contents/files/goniwalupuje.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/56456311191.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/66526509598.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/murowu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/g6ec4svqghhqsihmeripcr3r7p/nurawaxesidapuvoku.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/wakotokos.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/gumefirekozewarepek.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/14365820653.pdfIn PDF document text
    • http://lejuriste.ru/files/file/28957001960.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631905394_1623e40718.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613494b1150f6---30152821875.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/damigoli.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/62925676828.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/80826565420.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/61286532696.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gozumujetusudov.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/99264091644.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/6678278812.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/18440787344.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210911125532.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_off0000cb48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB48 10516 bytes
SHA-256: 91da047b8d707cce6a5995ae7b705bcc6fd955e870b518daee862c0d78ef3d64
font_01_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 18112 bytes
SHA-256: 2ef72ee590f28c9d810c4a43ebe08c04b6b23b91698319274e45c9e3d4eb362a
font_02_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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