Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7c5bccccfa0710…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 13:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4aaf9f5b4e688d6f76d3d75d0c5cfd6e SHA-1: ab112d5e39db49c9029794ac03c1b5bc648b5cd1 SHA-256: dc7c5bccccfa071098c9f9c697d46e528c45f46ab87b04eae7b5da543f89c86f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs pointing to disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=apps+to+install+on+new+android+phone PDF link annotation
    • https://myphi.biz/nbloom/fckuploads/file/ninaxapagetamabaninij.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/zezuzofaxagedol.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/tawakofipuxifazobikadugef.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kenikubukatipalomowiduj.pdfIn PDF document text
    • http://cartopack.be/Images/file/ketufokinukemajevisemu.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/januzikerav.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/17054823432.pdfIn PDF document text
    • https://grnca.org/img/files/files/5011746616.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c887de03d4---mawipexoravuba.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/54305187603.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/35136482025.pdfIn PDF document text
    • http://stl-hk.net/userfiles/44296353766.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/fizewutusijofuxeletil.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/96076345400.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/12607851919.pdfIn PDF document text
    • http://anduong-nhatthanh.com/uploads/news_file/1383190577.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/31032636043.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/tenuda.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/goxev.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/ditisaduz.pdfIn PDF document text
    • https://sayurmateng.com/contents/files/50809214170.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/60311573082.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d7c3a3d423545df4215a14c36d1c9090/18961326066.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/98423087372.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/dakisitirugega.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_off0000b3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 10556 bytes
SHA-256: c94fd7058143d1c89b39722f4ffe7a036bcf5d2b8a73e6d673bf660ea8c080f5
font_01_sfnt_off0000cc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC10 15664 bytes
SHA-256: 61221a32d88ca0a64b8aa19fd2c707061129e9f9238d1d6111d6e1efadde2b1b
font_02_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1