Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c10de22b5d3d53…

MALICIOUS

PDF

85.1 KB Created: 2021-10-12 10:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08ea5296eba511b7afd173b20f39ee2a SHA-1: db64fa98d939527cffd2d221cca94c5868bd5aa5 SHA-256: 91c10de22b5d3d53833cf27019246982fe3da71c607f6486d0a8e702c0bce859
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://laborke.ru/uplcv?utm_term=evaluate+the+indefinite+integral+using+substitution PDF link annotation
    • https://thebillionbottom.com/business_school/uploads/file/lituxetafiporop.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/72353188009.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/53018206935.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/91426228824.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/29170081729.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109201800116082.pdfIn PDF document text
    • http://cobmedia.hu/include/ratoj.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/73340256913.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/rerebawoger.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907170019.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/sowuwexuxasir.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/66191837944.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/bunaf.pdfIn PDF document text
    • https://iimranchi.ac.in/ckfinder/uploads/userfiles/files/burolidotiwuwivedoxa.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/84501307490.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/18446082109.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/91651997831.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/15993254194.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/putobax.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/15070243136.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/zofomuxutipawebipaxoba.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/56046267372.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/bijosokowuzawe.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/rurana.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/wopozifekotesowerune.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 1828 bytes
SHA-256: c65da4501f80be219574418733c77cb401adeeba023536fee640a710fe7be6ed
font_02_sfnt_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 10920 bytes
SHA-256: 1e0f96d2a651a44e8423754ec3efb1c6e337edf15d4c7ab920899b0ba5ecdc92
font_03_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 21688 bytes
SHA-256: 61da9cefa93790e8d827819c6fc97c34ac906f119167f4d70ff441ad7a652616

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