Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53196f17aed9631…

MALICIOUS

PDF

88.9 KB Created: 2021-09-08 20:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93bcaf9cebd30b14d2030361fbc929e7 SHA-1: 31b291702234c451a879cead295ccf5488550adc SHA-256: b53196f17aed963118756e2d2cbf4dc1d12e24205d12fc8bc2b39729aed7f4dd
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics strongly indicate that this document is designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=mass+spectra+of+organic+compounds+pdf PDF link annotation
    • https://mhreng.com/userfiles/file/gemuzewunezivazinuwatine.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/dolodex.pdfIn PDF document text
    • https://slotpt2.com/contents/files/telavadiwozeg.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/30605267968.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/divipotowuk.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/musiziwif.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1612f15b17e191---xepigaf.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/95002257639.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/samusoviret.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/31638212256.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/pumerinuxuxujewojafap.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/lutusudideju.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/59114403248.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dumbf1qfd4c42m0nvs6r85pv05/31799756767.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///mamazod.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137877abef7e---14181654537.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/biwojonijugavubalovewobap.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/62358698351.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/febebokogivijegovomi.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/guzibosokomevofunexuvab.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/bepuretexonijizoxot.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/40285079310.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///77601604454.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61619299980.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/bilotawogolu.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_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 11012 bytes
SHA-256: c56c046fcf151b556df3519002d1bc81abc037a3fca42f4d174d5c203e58b352
font_01_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 19056 bytes
SHA-256: 1fefdaa93c598831ee45c226eae3825886f2b6dabb932540219795bb3394f880
font_02_sfnt_off00013d83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1