Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d49dcb9ee757d7…

MALICIOUS

PDF

69.0 KB Created: 2021-09-24 14:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b9be6822a9ed77e7a7607000abca40fc SHA-1: 318212939018cb922fd7e69c828892f2ee2e08a3 SHA-256: a4d49dcb9ee757d7ca0c8d2132b8e68656020143b0b173c4d58c4683c3737c69
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback lure, prompting users to call a number for fake billing or security issues. While no scripts were directly extracted, the PDF structure and associated URLs suggest it is designed to lead users to malicious content or initiate fraudulent phone interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://tencanpowder.com/d/files/sanofebe.pdf In PDF document text
    • https://5974293.pasarantogel.com/contents/files/soxefotanebatisidoliduto.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/18261495641.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/34027008096.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/2613987186.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/18706356444.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/ninowaw.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/91962404443.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/pigiwexabaj.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/nigeled.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/wovegegatowaxamirixasa.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/wijur.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/44482572871.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/86912270354.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109011723425167.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/jonekevivurudigaxubokaban.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/87087183062.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/22657806044.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/simuseno.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/marepuf.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/jebexatij.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/razebiw.pdfIn PDF document text
    • https://emenu.hu/editor_up/viraririnobom.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/biriv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=download+wwe+file+for+ppssppPDF 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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC978 10480 bytes
SHA-256: 71b9cb59e1329127083798bc21fc3a0b073cb9f40bbcbbb771808659b902ed8d
font_02_sfnt_off0000e161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE161 14708 bytes
SHA-256: 4ea0f030a7e548150be79b569b79d18d026196147a3945f51701e0f1d6e9727c