Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab937d9bf9163286…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 09:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57b2538065835209598ce0771ced757b SHA-1: adc6d153d8c7ef70ebfd442885a4e881e8061512 SHA-256: ab937d9bf9163286e4235d44d592d84e9534f0164cdf81e19a5eac10f4d88761
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with many pointing to unknown domains, suggesting a link farm designed to lead users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirms this behavior, indicating a high likelihood of phishing or malware distribution. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier's high confidence score support the classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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
  • 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://evpersoneli.net/ev-personeli/file/82874269958.pdf In PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/77124893224.pdfIn PDF document text
    • https://capitolmodels.tuzonanet.net/userfiles/file/33684534336.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/lupebo.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/duvor.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/44657843164.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/5241412313.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/43538037623.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/6566620704.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/kedox.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/19075302362.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/kinoripawubanosef.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/98050616271.pdfIn PDF document text
    • https://derfo.info/resimler/files/xuvesawapilu.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/63552848745.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/57419859372.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/95914266393.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/54802753934.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/3306530384.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/wajatubiteranuked.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/84162222664.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/55771158348.pdfIn PDF document text
    • https://gerbangkuis.com/contents/files/28915957236.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/96699405126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+watch+after+movie+for+freePDF 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_off0000adf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC608 10424 bytes
SHA-256: 8843bb703e2546f1b689c336766edd546eb5d6478854dbc00c2ca6e5346cae54
font_02_sfnt_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 16148 bytes
SHA-256: 7adbfb64fcd6dcf4cecda0840495cb7a03ab63ab92127683a8a24d06b9107710