Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeda45a05e1bdacb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 12:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8f6dbdb361b09670c9b2318c883c9ba SHA-1: 672b5873cf01d73752f4b172fa80428f70523f01 SHA-256: aeda45a05e1bdacb66acca383ddfaa93d7028325ff0efdb59a2f936c94d5c308
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7377

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://infrive.ru/uplcv?utm_term=how+do+you+check+your+voicemail+on+your+phone
    • https://kingdom.vn/userfiles/file/67837298085.pdf
    • http://arucax.am/user_images/file/vebosagopigikimiwanufaw.pdf
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/72886235177.pdf
    • http://nocleginaplus.pl/uploads/userfiles/files/galanebivamebumogotivu.pdf
    • http://shriadinathbank.com/uploads/madamoviw.pdf
    • http://mdsalon.ru/img/lib/file/91911881729.pdf
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/88634674016.pdf
    • http://logo4you.dk/userfiles/file/39212033905.pdf
    • https://immsac.pe/sgi_userfiles/userfiles/files/48712819259.pdf
    • http://malifer.hu/upload/file/38960689948.pdf
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210912_6ED5137E02D412B0.pdf
    • http://seteo-dechets.com/images/file/32354533869.pdf
    • http://autoescuelatosal.com/galeria/files/42984710166.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/3214202325.pdf
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/10552875150.pdf
    • http://americandeliorder.com/uploads/files/rolimenovukipim.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16152702f80e0b---mobefefikeku.pdf
    • https://vinacomvietnam.vn/uploads/news_file/bevup.pdf
    • https://renewone.de/files/fasedugonubipaxewami.pdf
    • http://sl-light.ru/design/img/upload/file/63199039076.pdf
    • http://studiovalentini.eu/userfiles/files/37549720690.pdf
    • http://seattlebestteriyaki.com/uploads/files/37857089614.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b952.bin
eb8cb4e8de97f1df5d9f9e9a32a527e4b4428be29441874b8ba240224bcb8a67
pdf-font-stream PDF embedded font (sfnt) at offset 0xB952 19704 bytes
font_01_sfnt_off0000ec1f.bin
c0af1924bb468dca77d360fa48037d5c5f795693cf5acf0c35a0164ab4684cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 10964 bytes
font_02_sfnt_off00010557.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 16792 bytes