Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b4f097f3848207…

MALICIOUS

PDF

73.2 KB Created: 2021-09-20 00:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 527e21f4a1b1e1e7395ee3762cb6861e SHA-1: 1f956580899ef196898416f1f3ffc60d5e11c118 SHA-256: 37b4f097f38482073453ca3a5a56ccbce7865539b49cebe5e7eabf1bf7a65579
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing campaign. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the document structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://philabc.ru/uplcv?utm_term=justice+league+film+download
    • http://tdbm.vn/upload/files/titazovo.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/fabupovafu.pdf
    • http://pharmorgsyn.com/upload/files/puxesezinaniremeraromaza.pdf
    • http://russkiivopros.com/images/FCKeditor/file/39690164316.pdf
    • https://muzeumkonstancina.pl/attachments/file/lexigakazexonil.pdf
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/56148795989.pdf
    • https://avflash.nl/upload/files/xironetekoxaliredeku.pdf
    • https://datawire.gr/files/files/86522466056.pdf
    • http://svatba-emi.com/uploads/pages/files/44024468859.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/pikatipixigujigagixute.pdf
    • https://kaparatt.com/images/File/84407128230.pdf
    • http://saipanbooking.com/FileData/ckfinder/files/20210905_9CC28E2421550E30.pdf
    • http://clainvest.pl/userfiles/file/widokagokizux.pdf
    • http://kajo-frings.de/userfiles/file/pazisijekixiberasupuwegu.pdf
    • http://sameiroeventos.pt/ficheiros/292836881.pdf
    • http://pinturasoltra.com/images/slider/files/4098149240.pdf
    • http://autoscuolapezzano.it/userfiles/files/55352103274.pdf
    • https://fonixkoncert.hu/upload/file/1496831567.pdf
    • http://ingore.cn/upload/files/demazejopiterivazi.pdf
    • http://boldogelet.hu/media/35508852661.pdf
    • http://tomboy2.com/images/library/File/nalura.pdf
    • http://propack-th.com/image/upload/File/weganaromakutupogutare.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_off0000b925.bin
ead9b0ef6fc5a53ef0c177151d791487e30fe1066542eab3bb0a105992bd3171		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 10896 bytes
font_01_sfnt_off0000d247.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD247 16792 bytes
font_02_sfnt_off0000ea59.bin
83145211963b0114acc02055745b5b20afa39bd36e364412c061cb70883703df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 17604 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.