Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9b5af175570a90…

MALICIOUS

PDF

74.6 KB Created: 2021-09-19 01:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f789b7d0b5430bce9dd736009398b34 SHA-1: 5e0dd3b66e2b203b010b4c477fe7c70e6e477225 SHA-256: 1a9b5af175570a90590147b9b8e1f981263580117c6eda63c841bff7755249a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, indicating a strong intent to redirect users to potentially harmful sites. The PDF's structure and the presence of external URIs suggest it's designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=como+ordenar+fotos+por+fecha+en+android PDF link annotation
    • http://phunggia.biz/userfiles/file/35206154568.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/simujapun.pdfIn PDF document text
    • http://canadapremiumlubes.com/survey/userfiles/files/6228192734.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/zupusedepe.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/fakelumavodumakefuped.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/taxukavajaketoxida.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/disuzusuzegot.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/patuxivadeperen.pdfIn PDF document text
    • http://spbi.cz/res/file/93391221400.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/misulozunazonewavin.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/lifafimujomuwalivesixano.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/sipojewinuxisarukunawuba.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/fapuxifekoti.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/19425290991.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/puduzikawerisun.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d119f12687---12578488658.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/ziriziluzufo.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/zoxekufarezozelatenub.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/mazujesibubufoguxofumun.pdfIn PDF document text
    • https://j26clean.com/upload/files/96065730781.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/46608449042.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/powovivemerisekutul.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/62743185590.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/90613821472.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_off0000bfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFBF 17004 bytes
SHA-256: f61dca3006f74a80553f3b6e5cfb77a71cf849848414d9607a5c375ecbc3c951
font_01_sfnt_off0000ea36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA36 10868 bytes
SHA-256: 081b4c01c3423653689b31cc1376c2ac276baeaa728e6b500b2ef0dab8f94f9f
font_02_sfnt_off00010321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1