Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb38cd4df6496ae8…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 13:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e24c0216087b37e06fee8c35bd905770 SHA-1: 41a9235ffac9a892f0f56fee7031330e08a0e835 SHA-256: bb38cd4df6496ae8134fc454fb9d7bfe68b3d0809bfffbcf26cac2f1fe140a1a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing campaigns. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://matchedtubes.de/userfiles/file/11381956274.pdf In PDF document text
    • http://nprofit.hk/userfiles/5202328101.pdfIn PDF document text
    • http://chinalabware.ru/d/files/25633977185.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/35270278735.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/nawisaluwusaxovirugo.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/zoroxo.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/93065063931.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/25718694941.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/pizim.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/78459942743.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0940d5a15---zijatowomovovatatum.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/lomedewixudef.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/tenukomagamadosig.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/87476530478.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/67732069863.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/87438120701.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/lenunosizowujora.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/87229127721.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/34416713489.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/nujifiketesudabupuvobi.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/84901491483.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/32524564248.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/xodusepu.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/56275557186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=list+of+water+soluble+drugs+pdfPDF 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_off0000ead6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD6 19160 bytes
SHA-256: d8ebea37dbf14c895adf3b23e6dedd8559d52e533eae6fd551623435e26bb096
font_01_sfnt_off00011cb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB1 10852 bytes
SHA-256: ae05d2072a7a9d6e23e650187825f03387137dbf76dc1aca00d23c9a8c0a000a
font_02_sfnt_off00013587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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