Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb473c1c1b4a8e6d…

MALICIOUS

PDF

84.9 KB Created: 2021-09-12 23:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f1992a87bf0a63719fdd10c3d82889ce SHA-1: 77ac23477600cb799af92a5b55fe15912a67235f SHA-256: fb473c1c1b4a8e6d09889e58b25d946a9030b200f5a05e9013727b16b206c3e9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate malformed exploit streams and a link farm structure, suggesting the PDF is designed to redirect users to potentially malicious websites. The numerous embedded URLs point to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://huntic.ru/uplcv?utm_term=top+ios+rpg+games PDF link annotation
    • https://eklyps.net/images/file/26010683334.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42883038579.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/11330659886.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/8250215318.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/61402306064.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/watezu.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3c39e8616169058f0d9dc29886601dae/pewomazonafidazijel.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/71228043385.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390ff6cb27a---luwojazaleremalam.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/24809927289.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/potazolemodiwabiwa.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/22078103736.pdfIn PDF document text
    • http://e-menu.hu/editor_up/xuposob.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/35718652163.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/8547550473.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/18411159819.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/66365338268.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/bebinizulow.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/somapekeli.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202109050019077929.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/22587412471.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/80412191473.pdfIn PDF document text
    • http://schturman.ru/files/files/46350577609.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/3245025774.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/dadivis.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_off0000e9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AE 10312 bytes
SHA-256: 85fdb29ee061fd7372c1dddf235817a46fa86d9ad0252e84e753905beb6b391b
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 17244 bytes
SHA-256: 485725a33dfb6398d688fabec09def3b40809d32511a23dedf3400ee45eaf881
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1