Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bc769ab3a7731a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-11 14:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e30618c3e625ff3e7c2e6ea2b6726e5b SHA-1: 48745e408ad687b94ba7049e087e80fcce7b7c9b SHA-256: 32bc769ab3a7731aa8477249e3c9c221a49d7f319d72b7449adef885790f9768
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files on unknown or suspicious domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a network of links, likely to distribute malicious content or engage in phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://lonerangerfanclub.com/ckfinder/userfiles/files/79961770383.pdf In PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/63292403662.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/19086857044.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16130ae8424d7c---resevajux.pdfIn PDF document text
    • https://almavilag.hu/files/files/21479866790.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/3601236782.pdfIn PDF document text
    • http://amadesafar.ir/basefile/amadesafarir/files/kubokorosatufujozikevodek.pdfIn PDF document text
    • http://hijoin.hu/editor_up/kogojilipexipefezerupobux.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210907041034.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/malevupexexezotire.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/73868123069.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/2185521130.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/876b1acd2b7ddc024067d7555c237f2b/96701895680.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109051808571735.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210911_BE71F878E1091EC5.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/52155137217.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/89895783436.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/91519337590.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gezofodalav.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/91494326064.pdfIn PDF document text
    • http://haraj-alqunfudhah.com/userfiles/file/basexafakinosapi.pdfIn PDF document text
    • https://negaratoto.com/contents/files/werizoriwotawazajasita.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/14302555471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=core+connections+course+2+pdfPDF 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_off0000c328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC328 10656 bytes
SHA-256: f072a328668932ab3f1a1764b77fceeb53c255ca7cda3a4df94c04b85c5e4bce
font_01_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 15804 bytes
SHA-256: f9ab1e43ca6189812523c2a8e8f92e43c820f158cc610fc999b61373a3cd0f02