Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ac33e5b9226525…

MALICIOUS

PDF

73.6 KB Created: 2021-09-14 11:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58dd516b658dc6bf32758225811c3826 SHA-1: 9ea6538ca6cfee9757b1a9e5e4be20b0da85983a SHA-256: 42ac33e5b9226525f4e22ebcab31845be96bdc1baf70b757e70bcf3c0518704a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The presence of these URLs and the overall detection profile strongly indicate an attempt to redirect users to malicious sites, likely for credential harvesting 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 https://crysiq.ru/uplcv?utm_term=analisis+forense+android PDF link annotation
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/papozipadirunevuzanebe.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/soxabasoduveg.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132712a587e1---favebopowisupifalu.pdfIn PDF document text
    • http://rilta.net/userfiles/files/54115213752.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/93160384511.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210903_225318.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/10852507670.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/84976398056.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109030210377961.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/dimow.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-1/20210901202358511531.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/93547974642.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/dajibodukimal.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210904121631.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/goxigikiwuwijazafuw.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/21046122145.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/99750607752.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/30777970046.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/efdb33b7d271b1254f155b31324ecaa7/69327281180.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/kegazis.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/mubirewuvijot.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ganuzitaxitu.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/womixisut.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/52949821245.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/bugunilasusiz.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/lamopuluxera.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_off0000bcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF1 17376 bytes
SHA-256: 06b0fcc75b70f2dcaad5226aca5f4af993c1e3b09400d50fba151c6267b464d5
font_01_sfnt_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 10228 bytes
SHA-256: b98e3d28b1d06af5fcc1fe32927a9ce4488e6dbb91e98b6098b282eca95f15f5