Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c70ec18feec2a6c…

MALICIOUS

PDF

68.6 KB Created: 2021-09-26 10:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: cba7925e1359deff25c06383a0eb2501 SHA-1: d914b0b5419af81dd9d2e58ee50f33ef1e3a64f7 SHA-256: 8c70ec18feec2a6c667d663ab2fdd74d65443cfcd4609b06419fb34ffbd753bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, many of which are hosted on domains that appear to be link farms or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://csc021.com/userfiles/file/20210917140624_2gm670.pdf In PDF document text
    • http://pijntherapie.be/uploads/files/88068080349.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/7692901746.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/wokire.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/gonoribewuriripokex.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/91168255756.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/28159891640.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/wufajijenuzofubiwiromax.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/67688346899.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/juweloxineboxeviver.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/6703446176.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac52ce093---93915611468.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/timopukubup.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/mudesebix.pdfIn PDF document text
    • http://henca.com/files/details/file/novoka.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/2789804949.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/55060250635.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/23687831817.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/gatagirudasumupugagaza.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109090955176440.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/dubameguzepumevoke.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/86742062028.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/27456967039.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/94024230573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+steam+link+controllerPDF 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_off0000af39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF39 10604 bytes
SHA-256: cdc30c3a430811bf2541e9ef0e19333bf5c4f4b624b18e7e331267b56b75966e
font_01_sfnt_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 14924 bytes
SHA-256: 6b3a1dea95737d86109aa3b3ac3888573a9b549421905c752e7b08673d805af3
font_02_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1