Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd208885de3e49b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 12:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed560ebb75cc1cac1e14668c42e203bc SHA-1: 2fb23592abee3ec238ded6d84589975a146d0238 SHA-256: efd208885de3e49b00b5aae9fc97afc23b49545e68ec332375e316e26cccdb28
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the PDF acts as a link farm, directing users to numerous external URLs, many hosted on potentially disposable domains. The presence of multiple obfuscated URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://wastran.ru/uplcv?utm_term=winning+chess+chernev+pdf PDF link annotation
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613408dcc5808---zinebatuzuda.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/zejudenapifuzokosumetafez.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/8867403738.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kujavipituderupar.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/30200829357.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/53237179934.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/61218592459.pdfIn PDF document text
    • http://anindecor.pl/files/file/62744932796.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/52443479804.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tusuvus.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/17659076771.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/k7amdoof4mudg85egcckqlo55k/bosumojo.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/69597202027.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/fesorulodisuluzurifa.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/gupezofidinojisen.pdfIn PDF document text
    • http://wwstationery.com/files/file/91054917135.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/66990042969.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/51887138689.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109102308069002.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/52034302191.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/62792021459.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/26718392640.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/foxexubitopepukumijon.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/feranuparip.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_off0000d5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16508 bytes
SHA-256: 2e4c1912c8d9331569a07a0a4449f4a929262093ec7de4c0445691a4b327de30
font_02_sfnt_off00011884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11884 10532 bytes
SHA-256: df53abdc454c15455d3c6fce978873ee5d572b402f5e7351b776f1e79be0b973