Malicious PDF — malware analysis report

Static analysis result for SHA-256 105d6f3a2c402914…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 17:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8a9c9ac941f5556ce8a9fdf9163f7e4d SHA-1: 63bb9c6e7603b03ee14c7dd30fc663d0b0ea651b SHA-256: 105d6f3a2c40291495ac42aca1f1bfd1d327e98a72a457f24b3b00c27907616d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with a specific heuristic identifying it as a link farm designed to redirect users to various disposable hosts. While no scripts were extracted, the presence of many external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.vita-organic.eu/admin/ckfinder/userfiles/files/12241970598.pdf In PDF document text
    • http://scvumaichiramen.com/uploads/files/17170017310.pdfIn PDF document text
    • https://hinaweb.com/upload/file/99544960992.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/21745337993.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/wakubamunefupazezegizur.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/guwejujoji.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/wewadaxitepojezi.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/ruroxesivekin.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/wisojagexevoranujusofe.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/94136630439.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/xeneviwudusufat.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/12742695761.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/nizirisenusuwofez.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/juziz.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/junotila.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/92369972887.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/57358451992.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/zawamesuzapafesa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495d7fa4ff7---tetavumixilipujekuxo.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/80896218247.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nanejofope.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-4/20210904150841483631.pdfIn PDF document text
    • http://fructusartis.com/i/File/lebudufoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=real+cricket+18+beta+version+downloadPDF 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_off0000ae50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE50 14712 bytes
SHA-256: 0b9d6e4a2f5eecba7d8597b6b0513853a3e33420574685b83746005231ec5435
font_01_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB74 11052 bytes
SHA-256: 1d3e7b5c91737086f2ef2b89c5e51eaa6d7329b22402b667ab63c3056693b09b