Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e95e320bc34c94…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 01:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4cd7e72671300747af3b8d7120a2c211 SHA-1: 7b1953a75484a19bbf480abc2fbbd29bd84c5d02 SHA-256: 71e95e320bc34c94e7ff7ea3db3b8489ee011a12f441841b3a75f57a88db9cd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, indicating it is likely used to redirect users to malicious websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=slopro+para+android PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8lk595qehug1lb921g4f42c9b6/nimiponozujelejufib.pdfIn PDF document text
    • http://lamay.de/userfiles/file/78952492464.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/bomatanesolapiwopuv.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/95520264419.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/82717706058.pdfIn PDF document text
    • http://showdoimovel.com/files/files/pilovolo.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210911_F9B86EF3A3803214.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/xofasobetosima.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/68714112364.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/39811722272.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/39162128745.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/xovezuvanoju.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/femujowafaxogejagana.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/kawamulijotomarupa.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/596588873.pdfIn PDF document text
    • https://pratham.one/file/43176155689.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/giremiwilukoba.pdfIn PDF document text
    • http://gekon.net/userfiles/file/jusejabe.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/92311391207.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/15369999970.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/tovirij.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/81738216599.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613426c28a84a---rusewatus.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/73498050088.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_off0000ca6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 10060 bytes
SHA-256: 467eaf0dc309a9251f26ff2d24f4c1a04c58dd6eff9a575b41296f2601b18edd
font_02_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 18896 bytes
SHA-256: f6a29fe84b8d27122f622494549461055516b84f99afc54061ae119d3db45698

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