Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7031cedc8c52182…

MALICIOUS

PDF

72.5 KB Created: 2021-09-28 19:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b846729436610cd6d48a9e55a7b2c771 SHA-1: e41692f0b2f676c01a7456509af2e7adce3be097 SHA-256: a7031cedc8c52182bed4522cdeb6d35b5881db449f2e9ed6de3c0b27c28cfa99
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=android+operating+system+using+data PDF link annotation
    • http://goksirkrupskimlyn.pl/img/upload/files/lamezuxijokuberagako.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/bevazemugozirira.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/bufosekegazejemojov.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/83693607118.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/nafopenarukefapalu.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/39146250496.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/sepatekolulavasi.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/73242526494.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/22306070016.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/gakolazoruwibubitareku.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/golutaro.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8b6b00e60---bamodanovolamixusamib.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/forogisodupinajati.pdfIn PDF document text
    • http://suaups.net/userfiles/file/66219402331.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/dotezopolomefej.pdfIn PDF document text
    • https://emenu.hu/editor_up/saraturu.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/25705590778.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/satajikuvufazejero.pdfIn PDF document text
    • http://hangnhatbanonline.com/upload/files/65943506085.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/11534485935.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/39356168739.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161452634a1585---deradibamoxidaxugovinom.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/94399714982.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/zejixaju.pdfIn PDF document text
    • http://exima.kr/userData/board/file/jajodasased.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_off0000b6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 17400 bytes
SHA-256: 590514b69eb1ae8d03d472594d36d8e014b024216f6ec638dc88ec7e89218ebc
font_02_sfnt_off0000faef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEF 10884 bytes
SHA-256: 989805869a58de8cc3a30ab1bc937e74772a86d9927d668e58b3cb70d133cdba