Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f42f8ba7faf1aaf…

MALICIOUS

PDF

89.1 KB Created: 2021-02-28 13:29:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: de998b34b7e4ffbaf92e72d38c50d449 SHA-1: a1bafaebf64826e3de0a2d368642e77380f91d92 SHA-256: 8f42f8ba7faf1aaf5fe71bd19ca7fc48ee284fa15348f035829cedb1dba663e1
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://nipisod.ru/strik?utm_term=mainstay+metal+arm+futon+instructions PDF link annotation
    • http://thelandofbadideas.com/nutrition_during_pregnancy_and_lactationoj4dt.pdfIn PDF document text
    • http://allmedbook.com/565955218709emzp.pdfIn PDF document text
    • https://cdn.sqhk.co/riroxale/gifjiqY/datokagatajaxubusatotupif.pdfIn PDF document text
    • http://abanca-electronica.com/bukafojifigzie3f.pdfIn PDF document text
    • http://bostpolamos.site/vitadikefr7dq.pdfIn PDF document text
    • http://xosavetevo.22web.org/weather_report_hesperia_california.pdfIn PDF document text
    • https://cdn.sqhk.co/zedawuzijis/jSRjggj/39547476713.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_600b386379474.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/1gdhjRz/62809209652.pdfIn PDF document text
    • http://rijesukedad.22web.org/setutuzisibome.pdfIn PDF document text
    • https://cdn.sqhk.co/fujalapevame/apibjcQ/tasubokizukiwuka.pdfIn PDF document text
    • http://reduslimitalia-ufficiale.site/strike_betano_apk209b8.pdfIn PDF document text
    • http://basiditdcf.space/crash_bandicoot_psp_iso_espaoltix0i.pdfIn PDF document text
    • http://autobaff.xyz/clinical_evaluation_report40uuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469103/normal_5fd70f1910bb1.pdfIn PDF document text
    • https://cdn.sqhk.co/dorodidur/whffjhg/89466315222.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jitimixilu.epizy.com/watch_bollywood_movies_online_free.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 5136 bytes
SHA-256: b42f2955de7eb034d8c94e585483aa9b419b80eada901dad69c301ff97d0d80f
font_02_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 10912 bytes
SHA-256: 3f85c88444bf676f714c084a15dda71c108c1d28e7d10baf39228258e39090ac
font_03_sfnt_off0001422c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422C 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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