Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dfc5b7319ecdc1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 13:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1a8499b9563fad3d6937de1c7be631f SHA-1: 0133621a8304d9608f830d1d73ff2c32396ee3fc SHA-256: b4dfc5b7319ecdc14c88949f73bcd89d1c99baa0f314428c030de8624ca0ab83
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests a phishing or redirection campaign. The heuristic indicating a security bypass instruction to disable antivirus is a critical finding, strongly suggesting the document is designed to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=full+throttle+remastered+android PDF link annotation
    • https://lienlacanien.com/img_pages/file/22167148055.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/52604812353.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/paxufatawewisi.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/37938047473.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/werudile.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/73446966715.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/39421107496.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/voxokanepomomup.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/43665923597.pdfIn PDF document text
    • http://js-space.de/userfiles/file/85688932394.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/lunijebevajoxo.pdfIn PDF document text
    • http://hmed.vn/upload/files/fugivumutipaxezikopi.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/20140290856.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/gogisoruboxusananebor.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tirajasenosofelu.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/26359891755.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/bibotunevuwub.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/41987192455.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/pisubipepesi.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/beradave.pdfIn PDF document text
    • http://lyshiying.com/d/files/39788016668.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/46996243663.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/39130783110.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/99711947546.pdfIn PDF document text
    • http://farmina.ru/uploads/files/26276294218.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/92246451343.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/13332880391.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613827df901d1---40281649248.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_off0000dd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5C 10592 bytes
SHA-256: 21f50efa0350afdbf8a971a21eed082e9a87a3f9dfff19d4cc289fe4a845ad4f
font_01_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 19816 bytes
SHA-256: ddb9de102135280640630979f27660c0ed8446eb67db648d1f571345c6b5d91e
font_02_sfnt_off0001282d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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