Malicious PDF — malware analysis report

Static analysis result for SHA-256 205f7bc99e8bb57a…

MALICIOUS

PDF

71.7 KB Created: 2021-10-03 09:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 696ef3f6c027b0120bfffcb1e54c4916 SHA-1: 8aee002e94dec5aacce553aa6da5e3f3882ccfe5 SHA-256: 205f7bc99e8bb57a89a664314121156ea694b76e83265e102367e3a0dc48a894
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. No scripts were extracted, but the structure and URL patterns are consistent with a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cructi.ru/uplcv?utm_term=baby+boy+lyrics+for+king+and+country PDF link annotation
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/dedibedibuxa.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/bilipe.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/24651680365.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/20051309539.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/kigivapuveketezid.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40168194363.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/96100198608.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/watudojavotonesa.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/bovasekagusegibesojabi.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/86329289641.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bd36e4baf829902a9818276ad0efe65a/64908104280.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/pomagetubufira.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jimebij.pdfIn PDF document text
    • https://htchninc.com/d/files/kesedilotawarubakebazut.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/xukaze.pdfIn PDF document text
    • http://rpelektromont.cz/admin/obrazky/file/67967024448.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/16972947297.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/82771843080.pdfIn PDF document text
    • http://zenithmetals.com/files/fekesinitawi.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/bidigunem.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/6432201242.pdfIn PDF document text
    • http://geasit.it/userfiles/files/rutijumulanedojiraravi.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_off0000b3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF2 16476 bytes
SHA-256: ea04ca63038aa50beeb7d7cdf00b87e9eb945d82807731e45cfdd44f937427b5
font_02_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 11016 bytes
SHA-256: b4e4b5eed36088113cef17e4213366b53ee1fdb880edfcc7546f30093bb6b80d

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