Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b7ec5a7b8402af…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 16:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 331f92d57adfe9f5f8764db342da58d9 SHA-1: 971bf12ba9dbf03833c203338b32d08b51c7dd41 SHA-256: 56b7ec5a7b8402af92bd737ad09f8a0b1f95f99088390327df375724ef9f0d23
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many links on disposable domains, suggesting an attempt to obscure malicious destinations. While no scripts were directly extracted, the presence of external URIs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=how+to+qr+code+android PDF link annotation
    • https://plantbiochem.com/ckfinder/userfiles/files/mavotazonududizox.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9b5542a96ce231b411b975bc5db6ae12/18358159784.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/33780130483.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/wukaz.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/6431658686.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210916234718.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/xoxasizezanupimixuguza.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/simoburewexutejuvumixuzud.pdfIn PDF document text
    • http://nfc.soo.jp/file/legupemededigawulibaz.pdfIn PDF document text
    • https://terracell.info/images/file/fozadiverigimurajaxojizi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24e99ba95---rukeke.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/54865371879.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/74301499201.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nudedidunodajumovuzana.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/88963068890.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/jikirotifaruvurojupesu.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/gumisija.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/55317524791.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/81998188911.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/jededazaxa.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/86476546995.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wonavonogusom.pdfIn PDF document text
    • https://titishop.co/upload/files/97866810722.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/26343034991.pdfIn PDF document text
    • https://onwater.my/uploads/file/90502764036.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210917224840.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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF526 10372 bytes
SHA-256: cfd35e25eccdac5731495122ccbce8b7e7485233ee3dd7c9cc60a7ebd0e021e8
font_02_sfnt_off00010c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C78 17948 bytes
SHA-256: 8a898c8bf34c1b9830346a7352e6d034b5847a65909e9a2ec5303342a48ddc0b