Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f22791b85933cc6…

MALICIOUS

PDF

76.6 KB Created: 2021-09-22 16:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19e8e6b2a5e3fc59a750f5e4f09ed344 SHA-1: defc11a348e022bafe33639513fa8de2eb1f2fe4 SHA-256: 8f22791b85933cc6330f004d298b3be77abffb1fbcc48d75a84409d6e78e0e32
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable domains and one directly to an IP address, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ecoverservice.be/gallery/file/pibakuremakigug.pdf In PDF document text
    • http://vtvxm.vn/userfiles/file/xewuwolevidevasu.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/92014582897.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/99455558306.pdfPDF link annotation
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148f63ddd235---11193640832.pdfIn PDF document text
    • https://isleo.com/i_photos/file/zesuviwigoxebirov.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/70477695478.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-9/20210909075009968886.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/josurevekopisiro.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/wifexofemugajitotik.pdfIn PDF document text
    • http://ore-processing.ru/d/files/39205075412.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/kaxedexufa.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/21364882288.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/punenikowafugutiwapa.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210922200602.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/bijasazozebafisedujib.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/87084462116.pdfIn PDF document text
    • http://nawoo.net/userData/board/file/48672965189.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/60817948177.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd8273bb4f---farowumerabaw.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/77999840883.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/fipineneguvuxabuwajisiji.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/57407794515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=derivative+rules+of+exponential+functionsPDF 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_off0000c3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A7 10744 bytes
SHA-256: bbed452d0b590ec4aff81ec324d6d8bfa8e29320ed11de12e1eb0a472f89e011
font_01_sfnt_off0000dc92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 18276 bytes
SHA-256: d5d5db69cf72fe49a217d77015d6137880e97b51ea5ed12f30fd4250307bdeb9