Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f380546f0efcd28…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 00:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e18579f6e00550d04a470a980958c467 SHA-1: 2b5314793455dd5e628fdb5d94181e7fe8883244 SHA-256: 9f380546f0efcd281f3c749a307717b3d004655b49b8c043bac747c8020cf97c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. The presence of multiple unknown URLs suggests a distribution mechanism for further payloads or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://dynamicyunnan.com/ckfinder/userfiles/files/boxidupupikaxakogedugesa.pdf In PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/47157645934.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/83717789079.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/jutufafomuroribiba.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/gupukajovovatizupoluseso.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/patonimuvubevomufer.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/rixeluvigolarokekewusub.pdfIn PDF document text
    • https://sambelteri.com/contents/files/nuvigutumovoweger.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/49300315835.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/gorofutopiluzubidubebavoj.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/6303054162.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/rekabejabibesa.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/kaxijesigomode.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/24924820185.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9624a2ff48d4dad724dffd710617ff74/25814460872.pdfIn PDF document text
    • http://forti.in/userfiles/file/ranab.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/d8ru5u56nn3vaubum01bge71i2/30270161294.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091800541936.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109231826156248.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/pemejugixinefojunono.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/goxabinoduz.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/fitukotuzov.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/jujajerurexaguvawowafe.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/roderubob.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/38839769048.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=idle+hospital+tycoonPDF 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_off0000b1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B9 16476 bytes
SHA-256: 0a5585cb23192d39aacbbfb64283803114f9324c8fc64139d7c17be90e12bd59
font_01_sfnt_off0000dbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC7 10576 bytes
SHA-256: 3b2d0fe9c1012fb05a90109ac1710206a2fc6a0348aa4b9aab6d1fe3002164ed
font_02_sfnt_off0000f3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1