Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7ce65abb14439d…

MALICIOUS

PDF

93.3 KB Created: 2021-09-08 13:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c229a92cbb275ce69cc4b02956cbdd98 SHA-1: 4e165958bbec22d6ab6069e2c4c96af827a08b14 SHA-256: 2e7ce65abb14439d60bef707bd9daf4755c5c3af04366ae7d9d97ce1e751e8fb
126 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs were extracted, many hosted on potentially disposable domains, suggesting an attempt to obscure the final destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically points to a link farm structure designed to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307ea5ea94e---vomuw.pdf In PDF document text
    • http://tiszaikaland.hu/upload/file/dewelifisu.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/1254164270.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/fanivofanav.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/xezapomuzisuxatawix.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/xixududezojitapulis.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f789010be7---xazivirefegevibesofuxito.pdfIn PDF document text
    • http://bndweb.nl/upload/files/mojetet.pdfIn PDF document text
    • https://limsurempat.com/contents/files/1485469388.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///girotuza.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/tedudimojapabobifanojufiz.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/12511169979.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/26267827129.pdfIn PDF document text
    • https://ostrichpharmaceuticals.com/userfiles/file/5161062176.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/dugafimisabevijewemetig.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/lifudogarexa.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/43522884704.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/sotatezitos.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906132312.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/65337028038.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/52115717342.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/samobelakevetadi.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907102305.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=cashmere+misgovernment+pdfPDF 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_off00010828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 18068 bytes
SHA-256: 433f54ffcc3e9b5f3d71777c837597203222db417353bd11fdf5936a052af35c
font_02_sfnt_off00014efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EFA 10996 bytes
SHA-256: f0761c8672b5d11236d3cbf524e1ce4e05a60b5d7e45c90a78fd03fceda12bef