Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf05721b54cb0aa1…

MALICIOUS

PDF

82.8 KB Created: 2021-09-19 15:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 160ca7f62fecd0bcb27fe14bb45bd86b SHA-1: 8d18627b5a2df1ab582d1c2f7f98038b82ad686e SHA-256: bf05721b54cb0aa137ff64671055f172c628c77d30773f65ed479b77f48ab53f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=iphone+local+multiplayer+games
    • http://paulabenveniste.com/UserFiles/file/44114564670.pdf
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/rogoxejow.pdf
    • http://theffirm.com/userfiles/file/tulepexawudajafenas.pdf
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/fosafutusogesu.pdf
    • http://cukorbetegshop.hu/files/jevenisorurejasa.pdf
    • http://georgekoldun.com/var/upload/file/relokijujor.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/7027000750.pdf
    • http://solarissoft.com/img/userfiles/files/34185501965.pdf
    • http://nikolabartakova.cz/files/file/bilekurabufikomedida.pdf
    • http://aktifimmo.lu/userfiles/files/58493472796.pdf
    • https://parkettworld.com/upload/files/valezawobowasiger.pdf
    • https://tybistanbul.org/resimler/files/sunuxa.pdf
    • http://md-servicios.com/userfiles/file/zupilalexasarefe.pdf
    • http://quimis.org/js/ckfinder/userfiles/files/wikivixigosipenenaxoraguj.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142bd758d6fe---92187828111.pdf
    • http://yksskj.com/ckfinder/userfiles/files/dulirabudagamimuxa.pdf
    • http://55pluscommunityspecialist.com/userfiles/files/82983472787.pdf
    • https://ijaetis.org/ckfinder/userfiles/files/5576322006.pdf
    • https://ladida.asia/sporlegen/administrator/imagetempfile/kuzoxuvopulabusadik.pdf
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/tijawe.pdf
    • http://rentaruedas.com/files/others/24333248197.pdf
    • http://limobebe.com/userfiles/files/70456716372.pdf
    • https://mantyobras.com/userfiles/file/kejiwamariralixodamawuba.pdf
    • http://danieldesignpro.com/userfiles/97201243997.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddc8.bin
a11b1d591c31d7fd34a3b8e464c44627ca26d2df1cc3119955d82845784e8d48		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC8 10984 bytes
font_01_sfnt_off0000f71f.bin
6de024f04953307927d704a9aea5fa137fe8c1aa8bfb9eaeac1beb5029fa88f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 17624 bytes
font_02_sfnt_off00012515.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 16792 bytes

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