Malicious PDF — malware analysis report

Static analysis result for SHA-256 87021a23c84ccfad…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 06:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b985b545f0cb1ee83dc782e7b271381 SHA-1: 0b31445f8df5cd10a08aebd269251d7ef1ec6a4a SHA-256: 87021a23c84ccfad5965f5b3b50f481e7f616d191d4965bb0e4c5e11bccf6095
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=fear+the+walking+dead+s06+streaming PDF link annotation
    • https://cheeselicious.net/UserFiles/file/3708434149.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/mizulisurowevigivaj.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/liwixigezib.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/8616164530.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/18760112562.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/xogulejakupubo.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/93179192871.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49141020919.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/napanolupemedigu.pdfIn PDF document text
    • https://khanikango.in/file/71271416115.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/magejo.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210913203119.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e11528e5b---58702739926.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/2671334969.pdfIn PDF document text
    • https://defi128.com/userfiles/files/wefufiweritujegasi.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/perisaxazit.pdfIn PDF document text
    • http://freewest.at/muwegodepebotobazikuwot.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b1dfacaac48c459a657697c0a78f7b1e/suketunigodup.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/fotigexikarovizozosuk.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/weruzorafumed.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/8490464638.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/panuseporidilevitufoku.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/43296899642.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/90943087083.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_off0000eb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5F 18604 bytes
SHA-256: 1e7d75ee7bea1fc88e630c391dbd73398a513f02819bfb03b0a837be52019058
font_01_sfnt_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 11020 bytes
SHA-256: c6c3f7e65b4204e56380a930d78c52abcc768c6542a33fff7ff6ad34fd095bf8