Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2e2e6aa6beeee9b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 15:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 63669e2e9eb0ae688e0d7ac7ce3d67b3 SHA-1: fe8d2e2b7e0b0aed2a1ec2100c3a5d3c939171e9 SHA-256: a2e2e6aa6beeee9ba6ce8422b164a4b3c850fe2f5e1ad66ca43af6cf67519fb9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with numerous embedded URLs pointing to other PDF files. This suggests a tactic to manipulate search engine results or distribute further malicious content, aligning with a spearphishing attachment and malicious link attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://bjsddesign.com/filespath/files/20210905175636.pdf
    • http://lynxauto.ru/userfiles/file/vopexubamajololakada.pdf
    • http://paneldeconsos.com/userfiles/file/14284940444.pdf
    • https://chsromania.managenet.ro/images/file/4554049045.pdf
    • http://prepearl.com/uploadsfile/94271152200.pdf
    • https://natatourism.com/userfiles/files/mexebowewo.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/xisutebunumagigem.pdf
    • https://masukpt1.com/contents/files/vibowonijekavurabidip.pdf
    • https://nieruchomoscikomercyjne.co/files/file/25032819434.pdf
    • https://xuantruongtech.com/images/ckeditor/files/99658319008.pdf
    • http://idealhca.com/admin/images/file/92185368952.pdf
    • https://alirezamirmohammadi.com/images/upload/files/98299397971.pdf
    • https://prestinireedcorp.com/userfiles/files/lelusibi.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161358a90bce5d---toxaxukiwujemolit.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140c98981c2b---zilifekobuni.pdf
    • http://eventclub.pl/userfiles/file/gadurulugorutukuwepu.pdf
    • https://totalsewa.com/userfiles/file/rovegubimilugogezumeloram.pdf
    • http://balone.net/_upload/file///kizimopa.pdf
    • http://mayphatdienngocquang.com/media/ftp/file/40224900628.pdf
    • http://rzn-house.ru/upload/file/jupajopul.pdf
    • http://physocare.com/Images_upload/files/tidag.pdf
    • https://hippodrome-compiegne.fr/www/uploads/file/tedodapepuxisebegoli.pdf
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/91509680135.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ethical+considerations+dissertation+example
    • 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_off0000d2e3.bin
10d87b9811458200828e7d1336f01d13b8b8941d9c6d53fab674b4d5e08ce825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 17272 bytes
font_01_sfnt_off0000ff5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 16792 bytes
font_02_sfnt_off00011771.bin
1724d7cec3d001caf3d267ffa75d2f2da005a2911ce8c28eecf096b9c4d90972		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11771 10864 bytes

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