Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca0fd3360c8967bb…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 12:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c70d4cc258b41bc3ac757d5f52988ec1 SHA-1: 5fa120eed6abe82f203ebcddcf810750e8a1c021 SHA-256: ca0fd3360c8967bb7da936304545c8124e626c7e1218b279bf5bff355a397ea3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the true destination. The presence of external URIs and the ML classification strongly suggest a phishing or scam attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://saigonradio.com/userfiles/file/kinewonijuwoma.pdf In PDF document text
    • http://way-of-spirit.ru/upload/file/54568658868.pdfIn PDF document text
    • https://beaszemin.com/files/jerojuziwugo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a8ad9709179e06e2fe89d6c3f8117a56/46730330806.pdfIn PDF document text
    • https://digireg.es/upload/64449023740.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/xuzotidavitudigumidiso.pdfIn PDF document text
    • https://gencatakan.com/upload/file/17425429161.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/lefimubijolifudanet.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/14038240354.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/20285143960.pdfIn PDF document text
    • http://www.sudeshnamaulik.com/fckimages/file/84434121314.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/67170949081.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/velubavonajesuwupudo.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/33791865856.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/27123514086.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210905202352.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/65846957266.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pikufope.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/22165713404.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/28469039291.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/bizijodup.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/10963140561.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/tiwezozi.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/vasosavanasowu.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/47234929211.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/lifakorodu.pdfIn PDF document text
    • http://goldmustang.com/files/files/tapuzunimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+mod+mobile+downloadPDF 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_off0000e82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82D 10688 bytes
SHA-256: 5143fb517fccd547228b1fdeff669481a1c393f7011be4f36099d78c148558c6
font_01_sfnt_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C5 18092 bytes
SHA-256: 210550c1762ab568c88602f2c91709a45160d7ec04080849bae7bdbc61f827ad