Malicious PDF — malware analysis report

Static analysis result for SHA-256 668f269c0d86f824…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 17:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe13b4e12ea76dd246fa1040c97cdc64 SHA-1: 6dd610f0b40ed1cb2a2298f2297c73a25223035b SHA-256: 668f269c0d86f82458fbfa4a232007b0ba39e104d6b25335213bdccdf1fb689f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to potentially disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many links on less reputable domains, suggesting an attempt to obscure malicious intent or distribute various payloads. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://jiangsutravel.kr/userfiles/files/20210905_101757.pdf In PDF document text
    • http://telegid.tv/userfiles/file/pivemaziwuj.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/4675225993.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/79040171771.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/zefumesawat.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/panatan.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/bebosaxabesesofefix.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e38e9fc3c---45116520035.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/tapamolazologiminarozifap.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/58730376759.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/31488685566.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/pativuripukij.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/71037548563.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/27843496573.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/11928239089.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613754a4eed73---lepigiwivesogiwik.pdfIn PDF document text
    • http://gazetavk.ru/img/file/tipazi.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/nabokopopiseg.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/mimixasa.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/tezulasuxa.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/xovobopunuwomagi.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/26315885417.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/modapaluvulike.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/baditugofudavuresipikiba.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/31259665879.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/36485661444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=audio+video+editor+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_off0000dc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC50 10308 bytes
SHA-256: eff0e9a1453c1002fe06aea50c3c3925e4e0711b1443d8ab764662bd21b0de2d
font_01_sfnt_off0000f3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B1 18560 bytes
SHA-256: 0f0d37563005abff2df589940b74fb5a1c86c7a9ab676ec5f936c6723d424e4c
font_02_sfnt_off00012435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12435 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1