Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb09823822ea0080…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 09:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9eaa9d811a0378845638ee78224864b SHA-1: ba1514fef656e439098ec94c2945b89502d98f68 SHA-256: fb09823822ea008097723ad4ab83d14cb62dfa080310ae82575082e6e86cf5f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, directing users to numerous suspicious PDF files hosted on various domains, with one URL explicitly mentioning 'crack adobe suite'. Although no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://semsaesp.com/ckfinder/userfiles/files/10487124316.pdf In PDF document text
    • http://teranor.com/ckfinder/userfiles/files/xarokepezulorosubodid.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/tideva.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/489dda5c934948da467fbf62bc5b26d1/polod.pdfIn PDF document text
    • http://ipllaser.in/uploads/54756300710.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/jamaropodukurujomawezomut.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fcc75787a---32824459782.pdfIn PDF document text
    • https://labelmarket.eu/data/file/papobesopogeve.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/judavudorolaxosikaku.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/gimizupozuvomap.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/1772933472.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/5235382998.pdfIn PDF document text
    • http://secoinblock.com/upload/files/widupugupewix.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/3696565883.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/77285524497.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210912113429.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/golumobafumivosi.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///jikiwisedikozamuxojawegez.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/xiveguwudulaz.pdfIn PDF document text
    • http://www.depomatrial.com/file/21521271525.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/90358656854.pdfIn PDF document text
    • http://ranchobg.com/img/file/53091703890.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/34402827616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=crack+adobe+suitePDF link annotation
    • 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_off0000b8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D9 10576 bytes
SHA-256: 18f9669f6d63abdc8cec4b80a2feb4e1e365311fbef88d01fa86f642d4c45f04
font_02_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 17564 bytes
SHA-256: 80321ac3c9ee68e385b3e9e398810daabdc2005565e3f59b8b03107576fb8df6