Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07627c0726d3c51…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 14:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5dda94a30e0350232a457eb254913ce SHA-1: 11d016a63e00d56e7dddab54e6769b7b62f9932b SHA-256: c07627c0726d3c51f6e02c68c358a09ed44b501b9bc68b907c4b1d1dfe19957d
134 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous links to disposable hosting sites and a deceptive download button suggests a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and heuristic firings point to a malicious PDF designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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://shevtsov-art.com/uploads/files/tugojapodonodug.pdf In PDF document text
    • http://mamaskitchenorder.com/uploads/files/1173933433.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/jusikisalimidizowev.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/wobufumisapalezofu.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/52915774997.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/sofibuxabaposo.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/vekatovuwonota.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368084b5d21---pekexabulemokin.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/65973499227.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/tizujabe.pdfIn PDF document text
    • https://matricula.arendic.cl/files/bixurinedosabo.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/miduzizateviluloxad.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/12841154856.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/80700766673.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/37896920529.pdfIn PDF document text
    • https://fasaac.org/temp/files/sonasavidaja.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tefolatabigerukodi.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vovurabegojowepenedu.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/28105660019.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/sodatuvakupuputene.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bonetale+mod+apkPDF 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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 17736 bytes
SHA-256: 5dab50c12948e187b7f5bd905b5ddf174b622ea8d46c110318f30585c4c13d43
font_01_sfnt_off00011330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 10336 bytes
SHA-256: 97b5a0255010ef6e1c43ee28490aa4831998021d80e30c2d7d6c2fd29247f350
font_02_sfnt_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1