Malicious PDF — malware analysis report

Static analysis result for SHA-256 546b1eeaa3483445…

MALICIOUS

PDF

76.9 KB Created: 2021-09-21 00:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6f1d4cdbe6cc1dd4844f6749d22fef2c SHA-1: ab1c92f80800cab07699aa77f48c5a34302a1ee4 SHA-256: 546b1eeaa3483445626a524a0e4522f4beea938a12a3463ff8bf49c4db775bcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://crysiq.ru/uplcv?utm_term=lego+city+my+city+2+apk PDF link annotation
    • http://mxag.com/upload/browse/file/rijawotes.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/34753760374.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109052337128880.pdfIn PDF document text
    • http://sial.pl/galeria/file/ziwilegorifetikukolez.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/78782723049.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/35601344851.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/tinoxagafagixilomaterowi.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/30173274905.pdfIn PDF document text
    • http://palami.by/images/file/pixorimokanete.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/81160657128.pdfIn PDF document text
    • http://identik.hu/editor_up/50226341203.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3b55dc882---78591185979.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/89333931892.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/zizosu.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/pigorerekewedegilovelibo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486a21b05d5---komefadezujebab.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/judarujaruno.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/tevosavebadugewufurosu.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/16445407242.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/tuloguvabedomifokemev.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/10858109877.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/8039293722.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_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 10580 bytes
SHA-256: 754dc1685d7ce83be5745eed2e776c400c4d5e33319a0b81645a89e5b4cc9816
font_01_sfnt_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 18232 bytes
SHA-256: cdabc0eff03fd12222fb5fb970394a56a8cae214a45021dd2c2c243cdfd8fb20
font_02_sfnt_off00010df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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