Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b4bf4c457bc373…

MALICIOUS

PDF

74.2 KB Created: 2021-09-12 10:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65320cb894552d0e937164fb1b17ac31 SHA-1: 7fb309a405dbcc41f3bcfcc222c1b05f70f02380 SHA-256: 06b4bf4c457bc373fdf3b2d238488d2e67939dd6b413f3462bf3714a2a387a4c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with a high-confidence heuristic identifying a link to an algorithmically-generated URL, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URIs points to the document's role in directing users to potentially harmful content.

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://villahetzwartepaard.nl/survey/userfiles/files/40854201404.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f85d30dd---58842554304.pdfIn PDF document text
    • https://vientangluc.com/upload/files/65865301227.pdfIn PDF document text
    • http://7linc.com/uploadfiles/fckeditor/20210902/file/16305856472017.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/rijefususijagukeworak.pdfIn PDF document text
    • http://santehnika34.ru/images/file/69420920979.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135b17b0dcc9---28989494509.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/sanikawomosatekogorituma.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021090817161466.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/dubex.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/bulifuva.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/vojoximab.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/kolumajifinesoxi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/giladigexavigakixeda.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/38979599164.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jawomave.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/96295284086.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/voroxovaj.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/86141822687.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/98256369431.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/23846464253.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/wopogobakaripomatirogo.pdfIn PDF document text
    • http://ccsl.asia/files/xufenixerererurotunenow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=minecraft+pe+unlimited+coins+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_off0000c078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 16092 bytes
SHA-256: 5e68917f4ad73c498da8a6c3fea99128bbfd8d3478548352c77f185cedf9b5da
font_02_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 10964 bytes
SHA-256: 3df7a1771d47436de767460687400ecb0d35d8b4ba8d4002c77fa34bf4932183