Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a75c7181426fa8d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 15:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9278efdcc91b90724fdb8ee743c413f3 SHA-1: 3eb3e1424050cf16f64f02b0e7bcb3b641263462 SHA-256: 8a75c7181426fa8d29dbe7060267193543f59a98b89f151f9d32d09bb9fa0626
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=virology+principles+and+applications+2nd+edition+pdf PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161372bb2280e2---1449790319.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/lifoxowatiwavi.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/80488566928.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631022154.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/47627166218.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/92518159699.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/10811740125.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/98423520643.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/nuxega.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/26584666209.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/mopaxegojonefamevam.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/14607540275.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/gupove.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/zikuxeri.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/duduvigazesexo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191225677592.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/xipulobak.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/kofapejowixesenob.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/63609043002.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/89049788129.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/zutosogigadorafarijozoxir.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_off0000c76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC76F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 10996 bytes
SHA-256: 3b9407887179ecae7f891bea25203439b2cb38385cc6348d29b4cd11150c8427
font_02_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 22084 bytes
SHA-256: df84af7daf4d4e2fefeb83122f19c9c69b7c1cb29806c880e953d7ae3f7b3d4e

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