Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c89663bbb2a685e…

MALICIOUS

PDF

67.4 KB Created: 2021-09-11 20:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 3d6d921627a48b17da58e58e86ab6a42 SHA-1: 1bb64cf0333f49b75fbc0b54822bd59469b94bce SHA-256: 9c89663bbb2a685ee0b9f15a5c3a707a6d53b215c6560a0a67e7eb171a9826ce
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crewmak.ru/uplcv?utm_term=barrel+for+android PDF link annotation
    • http://www.smwiarus.pl/ckfinder/userfiles/files/32838816994.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/tiwovadeja.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/28231254749.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/87512649014.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/sunufemalekokinodakenigo.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/voxutuj.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/42038098813.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/86797418331.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133cb1144f66---lufovazajajigadum.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/33528857054.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/fifitefetomeredizazi.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/wizabalalugeluzizozew.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///94151816486.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/98927393554.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/vesuku.pdfIn PDF document text
    • https://micsys.in/userfiles/file/lifudajuxozuzufoten.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ruzurojur.pdfIn PDF document text
    • http://eichler-kammerer.de/73722238918.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/42773596025.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/44662837378.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210901183807792.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/jafal.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/welojoramiripovebeki.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_off0000ae6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6C 10136 bytes
SHA-256: 7eece5c04b807c46f66c77e1bc2e847cbb8c2711b8367d0f1c09962d8858d417
font_01_sfnt_off0000c51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 14228 bytes
SHA-256: 349144e7971de46f095b319a3112a0e86e3393b722ecf42275db76008a709f1e

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