Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4696f6189b6f38c…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 14:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ebbcdf911877c7f02d5fd81bb893456 SHA-1: 19f8643473807073fac1bd1936ab306db0b9a347 SHA-256: d4696f6189b6f38cda2ef091616586b90ecd7e08a072ece9cf83be02118781b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and utilize UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=cheat+dls+19 PDF link annotation
    • https://www.sistemkabin.com/ckfinder/userfiles/files/66278933841.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/lubog.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/pasowepolitulafakilegabub.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/lenafutoxarurikab.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/zuzinujijo.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xibewasexaliteroduvenemu.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/wakezepapawijexubil.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/nimizuzi.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/31894402044.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/dasopifarojoxe.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/fives.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/05t24ej9k8hguucdv1ov5uf315/94247545380.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/66308970728.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/16241668106.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/bowomaxujafamo.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/xejazodabureserubiv.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613266001e228---15341370536.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210905/files/20210905140443.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/bopebonegi.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/3269675340.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/puxojoxopinevajuxa.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/1313727557.pdfIn PDF document text
    • 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_off0000c437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC437 10180 bytes
SHA-256: dbae2b375ca5a75a3e61c8d98f1e2093dca53b692a5567503d35c4b73cfea50c
font_01_sfnt_off0000db43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 16788 bytes
SHA-256: 22fbadd3cf634615f55db55dc8be79cc6904cccf31c678b0cb3464e3f5a112dc