Malicious PDF — malware analysis report

Static analysis result for SHA-256 f792a3b1ce3c6b2c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-17 08:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b9bbe401a30859475b0d19027aa2e477 SHA-1: 639b2b38274705e5dfea9018605ace0dfa141ee5 SHA-256: f792a3b1ce3c6b2c576609c35fed614b0810cc337205cb9152dd7764387bf547
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a phishing or link-farming operation. The PDF structure and embedded URLs are consistent with spearphishing attachments used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://cachnhietwin.com/luutru/files/bofotisifelixu.pdf In PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/9611811590.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/mapukalekifa.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/85128454775.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/80012969026.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/84036739485.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/fibemum.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/57832516750.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905011148.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910153343.pdfIn PDF document text
    • http://termosystem.pl/userfiles/file/54165157854.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/paboxakanenuju.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d71ed3be53e35f758cbde9b9d897b04a/vodoxosizipapej.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/ratuvozalezikuxidip.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/649804181.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • https://benqmusicworkshop.com/fupload/file/pamakukevidiwinazamujote.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/lewedesit.pdfIn PDF document text
    • http://panteres.com/files/files/20493076758.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021914222364459.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/metazadefirupimolelajurul.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/jemukenafiporu.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/66197006414.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c359924083---rawafogaxiwutanatete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=power+mp3+player+for+androidPDF 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_off0000f0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A2 10764 bytes
SHA-256: 5e4859fa83d0a16f2b5aede2d2b8feb9ef7cd12bd483808e42d63b7dae2ec033
font_01_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 18860 bytes
SHA-256: b609360f56826221c64d9bf5fd8ff1c150005f92db0e529841bdffa89ad2b3d1
font_02_sfnt_off00013ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1