Malicious PDF — malware analysis report

Static analysis result for SHA-256 490e06da99ec9a18…

MALICIOUS

PDF

74.3 KB Created: 2021-09-21 00:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6253126adce114590363a862cd37be97 SHA-1: 0a3da5c81f37975691940b9e004eb5bf87026435 SHA-256: 490e06da99ec9a18a67a1779d970794128177722148da335734f4d00804af4e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or are structured as link farms, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=pubg+android+hack PDF link annotation
    • http://tauroconsulting.pl/userfiles/file/digosaj.pdfIn PDF document text
    • http://obedovice.cz/userfiles/file/12583726098.pdfIn PDF document text
    • http://csp.hu/editor_up/fafijukusifinenatijotufi.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/17520959168.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/51697442818.pdfIn PDF document text
    • http://www.moyekolodin.com/files/88437042226.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314e6938c17---minezoverubegiletilikawe.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/65952775916.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/49937803524.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/dewuluwoxifiriba.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/82552148734.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/6432330046.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/mewilowajadulemobito.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/koxexaronetavisarejepowu.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/72455543956.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/nefuzipipa.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rimepavotoxebusojudiw.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/dutevimowirir.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/pokovafavorawu.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/57431479990.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fa1e731ce---65800785644.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/29171987864.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_off0000c14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 16552 bytes
SHA-256: f38d6ee53aaa566367fc0bb36096bff864f56443f743bec514ddc4ded0534ef0
font_01_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 10536 bytes
SHA-256: 0eb1a9dfc39d4afb6533d84139c5abe93a9e7ef5c214c43c9fe648bb56548e36
font_02_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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