Malicious PDF — malware analysis report

Static analysis result for SHA-256 53de1b7585661328…

MALICIOUS

PDF

72.0 KB Created: 2021-09-18 21:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab726cae9ef9d0d4814add0850f8e020 SHA-1: fb24780ac89e01925b049ba48da2e0e62aff0ab0 SHA-256: 53de1b7585661328404079dbc0b8f49862a95afeffbfd2a4421f1badda2eb83c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate that the document's primary purpose is to redirect users to potentially harmful websites.

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://oniceh.ru/uplcv?utm_term=manual+wais+iv+pdf PDF link annotation
    • http://www.allatpatikapecs.hu/images/file/53040034258.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/fasuwazamuxovagexegola.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/watefowevigi.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/96184195959.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/5544644504.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pupesufuluj.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac44c424bd---ruriwenukimatupidapefog.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/54518644159.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/89261419895.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/mufiva.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/ziminunotijufewi.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/93262275329.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kulixage.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/rikajutiwaxube.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/wiburi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/e19eeed3673328863fdfeac4c47de4fd/49102514482.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/fewarafuwimidozufufex.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/kefumezuwogojifuja.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/xatagakirisutogirob.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/89324217150.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/gerikan.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/42259331623.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bamesaxifagisasasezud.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_off0000b912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB912 16384 bytes
SHA-256: 1f3ca67764e14165559bd782ff8a60cdbd6de1c714f1726992350177fc2ccb73
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 10288 bytes
SHA-256: 68e68a69be152d85545379c4bd08369fbd982f185fe69ae7e603c9d2d9091e25
font_02_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1