Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3befb51b4b7b318…

MALICIOUS

PDF

77.6 KB Created: 2021-09-25 19:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d30245227ef22c9733ac0587cc05464 SHA-1: eece0db4ee1472e25839ff42b05ea856477629fb SHA-256: b3befb51b4b7b318ae11d30ed90ec884791d9aa34fcc873fd20d1afc3b0d70db
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The embedded URLs point to domains commonly associated with phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://smidgel.ru/uplcv?utm_term=how+to+send+voicemail+on+android PDF link annotation
    • http://topoint.net/userfiles/fckFile/20210909235114.pdfIn PDF document text
    • https://msvadba.ru/files/file/texoruboramejijazon.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/53485852404.pdfIn PDF document text
    • https://wasael.com/userfiles/file/66585594224.pdfIn PDF document text
    • http://www.520amis.com/upload/files/27977275014.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/zoperuvutuwanavanogid.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/19667777086136f4101b3aa.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/89977600097.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/wusakoregepupofedezur.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/fubosi.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/nazosupirudekepudujus.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/90345828247.pdfIn PDF document text
    • http://adice-area.com/pictures/files/91512402121.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/movekikojijudex.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/senawapore.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/28457018985.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/53279871337.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/33726711365.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/87944072012.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/dabarufudavame.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/95494047290.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/tiwizawogapu.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/57238404845.pdfIn PDF document text
    • https://filetorme.com/upload/files/90274875945.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/63126331553.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_off0000c8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A4 18400 bytes
SHA-256: 4ecd6cc38cd6205df0f01e782ecdc60467fd13af5cf8e209a7f98b47c03ed48c
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 10672 bytes
SHA-256: 077c2962f3d03f20812bebbb222d3488a51d2d1da50a64c749796ac449fde194

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