Malicious PDF — malware analysis report

Static analysis result for SHA-256 12948ee6f84b4be0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 06:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 52db32cf2eb0b1ec91e6a1c267744f70 SHA-1: 5fb98a5344ae6806f041fdd9a7ebaac323279b37 SHA-256: 12948ee6f84b4be010a2ddea49cda8d4e4d377f64c5471ab68468be61da9268e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing or malware distribution lure. It contains multiple links to external PDF files hosted on various domains, some of which point to IP addresses, suggesting an attempt to host and distribute further malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of using disposable or algorithmically generated URLs for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://brette-animation.com/userfiles/file/kipivijota.pdf In PDF document text
    • https://lmbri.com/WYSIWYGImage/file/13613225556.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/80181728196.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/39413312834.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/17617108814.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/38441807969.pdfIn PDF document text
    • https://kimansion.com/uploads/file/tokibonawomuzivanav.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/ditetixumu.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/buperakufepora.pdfIn PDF document text
    • https://ptogel2.com/contents/files/15370008070.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3a28b8e6c1b3ea022e849dca15d379f1/82595231053.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/78380600177.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/23669516682.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/tatefori.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/figajuxajewimalariwex.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/95919553527.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/siguliwasas.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210911_3A37E16D09EBEAE3.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/jevedi.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/muzikolagi.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b69290beb2---50379040094.pdfPDF link annotation
    • http://abbeloosschinkels.be/userfiles/file/72639674864.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/92921465269.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bolufukewasaxonimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=assassin%27s+creed+pirates+iosPDF 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_off0000caee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 10476 bytes
SHA-256: 18239df44579179764ad873f778f77580b93c110a02eea9bd0776d70f0ef8fc8
font_01_sfnt_off0000e2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFC 21464 bytes
SHA-256: f92e429e652dfe913bc5c64dcd0993a12bdb73bb16cdc37ebcff6d44993c969b

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