Malicious PDF — malware analysis report

Static analysis result for SHA-256 3803511d71529b75…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 00:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: af3cdece2efff96defe87d3ad92a1361 SHA-1: ffbd772b5d4ecffcedabf0df0b22cc56f4040bfe SHA-256: 3803511d71529b759dd885bcfcb415c296af18a463ef532d993c7a0c864d2f5b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=sweater+weather+roblox+id+code PDF link annotation
    • http://vhshf.de/File/58573236597.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/930fbe52d368341b92148b3741423416/dobux.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/voduxitupezobusu.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210908_991A107CE1B59B79.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/zoxokodabofufadugin.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/batafeze.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/96556475248.pdfIn PDF document text
    • http://hmed.vn/upload/files/7962995123.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/55728870841.pdfIn PDF document text
    • https://dortmundpools.com/contents/files/gaxomufikig.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6c98e429---wejetobulujefoxikakaj.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/1002374510.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210913051149.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/ranozuwuwudewotuwuwe.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/zilutezumo.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/mobexubafas.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/xigepanevuzo.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///68219579111.pdfIn PDF document text
    • http://52963566.com/upload/file/202109060302304181.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/32220281565.pdfIn PDF document text
    • http://hanleyresources.com/images/didugaxelino.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/84011680957.pdfIn PDF document text
    • https://hse.tw/upload/file/67346995301.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/35576617400.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_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 18016 bytes
SHA-256: f17620925a47ab7d361deb2f8c6dede2410c1438e260cf35ca3273f4546d1198
font_02_sfnt_off00012192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12192 10600 bytes
SHA-256: 4ab76abedf5bee1e8bec27fc462f97fe8986113551eff700e485fcafc6d8c150

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