Malicious PDF — malware analysis report

Static analysis result for SHA-256 070887ec7547e4b5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 07:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94e33cd42e0f43638bec9638a3e6c223 SHA-1: e597836462966e7c33a794842dcd0e47fceedb2f SHA-256: 070887ec7547e4b526704e9b0b3aaf7ad82b85cb0b29f8f59eb1eb7678dc8bd2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a scheme to distribute malicious content or phish users by linking to many external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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
  • 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://prestinieurope.ch/userfiles/files/setepukijuw.pdf
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/ridut.pdf
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/jisofetifabisopapam.pdf
    • https://yellowmangocafe.com/userfiles/file/19422335556.pdf
    • http://netmode.net/app/webroot/uploads/files/nemelatofobusagugiz.pdf
    • http://graviroz.hu/ckfinder/userfiles/files/55335220178.pdf
    • https://icon-studios.com/userfiles/file/50970615764.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161494ca548c33---kafuninorusivixegikuzata.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/katizukigipegolumixixo.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134180d81208---xixajalep.pdf
    • https://sieuviet.net/webroot/img/files/82317896094.pdf
    • http://robalton.es/Albums/images/file///zujujixig.pdf
    • http://coming-c.com/userfiles/file/90358051128.pdf
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/15562688472.pdf
    • http://nanumed.ro/uploads/files/vomebuvenusulopo.pdf
    • http://metamorfozyayincilik.com/userfiles/file/repitatiwe.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/56650163531.pdf
    • http://kartywspomnien.pl/uploads/assets/file/muzedi.pdf
    • https://strefaokazji.pl/uploaded/file/mojozurulovifaxolodusim.pdf
    • http://dytac.hk/userfiles/fazolekepebitotibesutapet.pdf
    • http://constantcontinuity.com/membership/data/files/dumilumilibajole.pdf
    • http://hwangtosidae.com/userData/ebizro_board/file/488433883.pdf
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/dumoxigilikamugologe.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=convert+pdf+ke+epub
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000b092.bin
a0921599670024a1524e35db854f4feb6ad6c2cac6f29152e9a6bac25e10075e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB092 16544 bytes
font_01_sfnt_off0000da9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9C 16792 bytes
font_02_sfnt_off0000f2b3.bin
3f7624692c75ee83a85b812e2bff3580ccf403c5cd36ba1b8cd138598a546aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 10452 bytes

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