Malicious PDF — malware analysis report

Static analysis result for SHA-256 7241476b93aaa610…

MALICIOUS

PDF

77.9 KB Created: 2021-09-11 13:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5237478786d73ac8872a6b8db882fb7f SHA-1: 178869435263e815c659846b27f3806ad2e4dd36 SHA-256: 7241476b93aaa61068af82ee19ec3c71d7de7ca347a1841c4ce755fa6963a264
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://avela.md/userfiles/file/mezemowuwozanabobupum.pdf In PDF document text
    • https://ncsccalgary.com/userfiles/files/nedadekoxigaxu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/xepili.pdfIn PDF document text
    • https://patc.fr/imagesfile/35624173164.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/wudizozodevetujivefuru.pdfIn PDF document text
    • http://profstil.az/userfiles/file/16452980307.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/xaruwuvizefisil.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139f86fc59ec---48442840857.pdfIn PDF document text
    • http://kesifveotesi.com/files/sereperav.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/58935154844.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/febuwefegoza.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/gupufiwuza.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/kegipifofut.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/95c5a723e5b915f360221bc57a8cb023/dogujujedidefanawujegev.pdfIn PDF document text
    • https://jin-ji.com/upload/files/95950880865.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/94283755618.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/93352775800.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/67206856050.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/xizomuxiwesozowosinup.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/42265749841.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/31436359138.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/mabesukum.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/sotubafiralerenelivebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chord+she+will+be+lovePDF 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_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 17988 bytes
SHA-256: 2937f9d80890af806656fdc8f033e0008cde6d95ab554fb18d1a0e0d47406427
font_02_sfnt_off00011272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11272 10304 bytes
SHA-256: 50a686e9ef312c34e75b1f43bf8a335495eebca066ddcddee43fc5b67287ce00

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