Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b671855fa79177…

MALICIOUS

PDF

68.8 KB Created: 2021-10-04 01:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 04da8cb648220e8d247bfc0b014475f2 SHA-1: d6011ddfa739508bf000193c21916b85de97e85c SHA-256: 85b671855fa79177a1039c85ddf1942e9d3341124c23819b869974f75f51f7fc
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 for 'Pdf.Phishing.Trojan'. The presence of numerous embedded links, many pointing to disposable domains or link farms, strongly suggests a phishing or malware distribution attempt. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://oniceh.ru/uplcv?utm_term=directions+to+office PDF link annotation
    • https://xylemleads.com/userfiles/file/6141422302.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/53058685160.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/lesilegasavazowaxo.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/46626542381.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/diwepemefeliz.pdfIn PDF document text
    • http://ozkayalarlojistik.com/userfiles/file/22744617858.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210916010521.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3524f02a537173b5488851d9a331dfe2/52361570217.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/92500134885.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/wejudazezidizelobasuz.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/28340224564.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/97919300251.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/41984029234.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/84692199199.pdfIn PDF document text
    • http://briztravel.com/upload/files/buwavejosufubare.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/88448517841.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/rubevanixut.pdfIn PDF document text
    • http://sbsedupatti.com/sbsedupatti/userfiles/file/tipamopito.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/zimidipu.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/42202151336.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/41753314973.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/29768664486.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0e0d1b2ac---fogovuwolapozolitekoxix.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/jokifaganufarogodubo.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_off0000afff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC816 10124 bytes
SHA-256: e45fd354274c8627b3145aa6d9008cb51c533f48fa5e7334c88e3bb82fe9f951
font_02_sfnt_off0000ded4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 15688 bytes
SHA-256: 6d72b9cc3461aa3586d5d9c3c60bbe42729e5397db525b4583a5770729bf055f