Malicious PDF — malware analysis report

Static analysis result for SHA-256 79469be3fe4e8132…

MALICIOUS

PDF

76.6 KB Created: 2021-09-17 12:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 594795d9444a3c0e05cd5243be84c934 SHA-1: c2402c656a64e31b3c05ff2dde28090c572d4849 SHA-256: 79469be3fe4e813284a3ace29aa894e6fcd1cca52693c52b4e3eabe761f03836
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. The heuristics indicate it functions as a link farm, directing users to multiple unknown PDF files hosted on various domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c9520120db3041ee87d93012ab35f912/33694060573.pdf In PDF document text
    • http://krallarintavugu.com/upload/file/puwolufotun.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/jekud.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/jazewupi.pdfIn PDF document text
    • https://citytrafik.nu/images/file/81280460070.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/fabedebowika.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/tewezofigavo.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/19477162943.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/8037936554.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/rasedanozivozasomipojus.pdfIn PDF document text
    • https://onwater.my/uploads/file/xolodoperubaban.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb35b48fdb---59014532616.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/53089986830.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wugabusirexikozenazuzuja.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/ruboriwatasevuzojox.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/topenadekajizazeguwezuk.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/32667988563.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/79364157252.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/zozujeboxile.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/45725056644.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/97778613730.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/sabukeji.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/57497935140.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/57249947145.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/gusepizeridi.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/36386639650.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/budagobetuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=alto+pdf+to+word+converter+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_off0000c84c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE063 10576 bytes
SHA-256: 8e62711e3202e1f959a543e7ad37f6fa1b604c860f915514acfa922d864783c1
font_02_sfnt_off0000f8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C2 16972 bytes
SHA-256: 95e801dfac3eaf721a570e261b6ef310084b5fc85eaa5aec300a175b8dd217b2