Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62d8edf7b71b6c6…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 13:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0029bc0063ae6ace9444572836774f15 SHA-1: 299196fe10fa3aaea936c93277e43ae3ab669d57 SHA-256: c62d8edf7b71b6c69bc76972e998a562fc6e4baa9abb9c9ef54e5cff06f359e4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=pes+2016+ppsspp+iso PDF link annotation
    • https://biroestarsa.hu/uploads/file/64578547808.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/49273133139.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/tovizubojupinapa.pdfIn PDF document text
    • http://vinmexindia.com/uploads/94391097435.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/72943664667.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/63088291420.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/26630919171.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/55142718049.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/39763521280.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/mubuk.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/31391414652.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/64102404951.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/21007761550.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/17992918649.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/38231949404.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/namabomizibizebode.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/61818836170.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/digowulax.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1615029067c92f---selesuz.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/91475332239.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/fitel.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/46473362243.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614814c3f1952---76511080369.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/96024324785.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_off0000b23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4D 18328 bytes
SHA-256: 276bc576cea18668679da22462aaa5ce3f336c666b3f9928658309651ad44d91
font_02_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 10200 bytes
SHA-256: a9e002cd613eaaf26b1aaa3968747822a231454a036ec078c936021e6d4957bd