Malicious PDF — malware analysis report

Static analysis result for SHA-256 995dbbdb122a81a8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-23 04:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9e3bafd773c49c86ab15db504e95dc9 SHA-1: b78e9eaba78f1ff583a3780544adbf1dff916f19 SHA-256: 995dbbdb122a81a80b22a8aeecb82d719679a7804aa15c6f4d19b952fe69d4fb
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to other PDF files hosted on various domains, indicating a link farm. The ClamAV detection and the heuristic identifying it as a link farm on disposable hosting suggest malicious intent, likely for SEO manipulation or to distribute further malware. The presence of many unknown reputation URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4647

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://lex.tj/img/file/2177379888.pdf In PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0922/420b2fad64e5436ce28abfc6b6bdc5df.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/42483664535.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/82219203989.pdfIn PDF document text
    • http://potya.com/fijugupuvi.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/35962900502.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/34044556452.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/sapuriguminadevipa.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/52648913178.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/67545200665.pdfIn PDF document text
    • https://558com.vegner.com/userfiles/files/20210919_034803.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161462ab95577d---morulifozarujo.pdfIn PDF document text
    • http://annabarons.com/files/files/pulijozinigo.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/42284913232.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/82521379631.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/11871066193.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/43536960786.pdfIn PDF document text
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/lorokibiwapulowujibi.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/nunebalatuxi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8225ee4b---80391083617.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/jafejorem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=smartphone+as+gamepadPDF link annotation
    • https://mediaget.com/userfiles/files/18586711220.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43C 20828 bytes
SHA-256: d4af7a9c185be146f73561d97f1ca1b7116e5635fc0358f2e7c1566279f95042
font_01_sfnt_off000128fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FB 10776 bytes
SHA-256: fb8d39e1929e4500b1856f92e8ead599cd9b35d12033e6fe63ee72497a2f971d