Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc758557481970b2…

MALICIOUS

PDF

73.2 KB Created: 2021-09-21 11:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11ee5c69be465f5397a3f8d20b9106c9 SHA-1: 311d0d45de4716630d2370d1166eef96888f66cf SHA-256: bc758557481970b2b70305d26f0fb256dde902b8cb93484a158be8360f25d556
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed as a link farm, pointing to numerous external URLs. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://gonzagafood.com/userfiles/files/3746608605.pdf In PDF document text
    • http://i-daa-wl.de/userfiles/powatesebotaburadisuza.pdfIn PDF document text
    • http://elitvorota.ru/f/file/76458655178.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/91736159910.pdfIn PDF document text
    • https://kildevangen.dk/files/51433231754.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/36922529088.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/38710033897.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d26aafd52---ziwoxeduxafe.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/jivodikotuwepinin.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/29297968585.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/8207003532.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/38993327204.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kfqi61o8nf77crrah725bkace5/vakowedadugafazugovir.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021951757467589.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/mebokukojigojinoxakisube.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/75688025011.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/bifetiviwiw.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/dusurex.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/wokasirar.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/kubunibabojowubesanez.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/20086116093.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/28850612248.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/30200621524.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/44802819133.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/fopezufixem.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/xosawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+overcoat+by+nikolai+gogol+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_off0000b978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB978 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 17220 bytes
SHA-256: 3a4e3182975e4a5fb963a0a529dd39ff95654ed6687869d8e080a7f80c1970e0
font_02_sfnt_off0000fdcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCB 11104 bytes
SHA-256: 027f5f09294500df27fd6c83fdc79b408e86789330d73df69d51feeaa00b8e9f