Malicious PDF — malware analysis report

Static analysis result for SHA-256 c285a1315d55cace…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 03:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 827ec04824b72ebb96f35eda5207f59b SHA-1: 81032efc0a505ba53f615b51fe55d6fff4a26641 SHA-256: c285a1315d55cace64230a8daaa0395e121485df9d860860104e0a3a74cef2c9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by multiple engines, including ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://macabrey-luthier.fr/data/Files/7437012631.pdf In PDF document text
    • http://jandenzobv.com/image_uploads/file/75217433508.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/tolirupasa.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/19346731189.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/dizomesujigapoxavutukep.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210922_192304.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/kutewegetapilegelosuzal.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/14869321112.pdfIn PDF document text
    • https://drterrace.com/london-100.com/userfiles/file/53220943884.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/47416724910.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/515227641.pdfIn PDF document text
    • http://georgecourey.com/fck_user_files/file/96575667457.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/woketipax.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/beduwojanezajalawozafepi.pdfIn PDF document text
    • http://onelove.cz/file/68680390039.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/2340330382.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/tinokonakifajusaso.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/12899956701.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/9985937929.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/pabujutedevab.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/68076098159.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/81262132379.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/30375876261.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/29561705541.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/43spqrdmmhnike966tebef3kt3/xabozenuledo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5a0d4963---bufax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=nune+2016+full+movie+freePDF link annotation
    • 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_off0000b42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42D 15368 bytes
SHA-256: f73603e6b5163cc75ff62ea362f5f7d0ba2fed52727016284c1ed540418adb16
font_01_sfnt_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 10552 bytes
SHA-256: 86feea9788267a6a23fa76b4733505a48975c411c489259428e07a6c9254fcdc
font_02_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1