Malicious PDF — malware analysis report

Static analysis result for SHA-256 197453630fd6d82c…

MALICIOUS

PDF

83.2 KB Created: 2021-09-21 21:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88418ab45b32cdd01acfc35e78efc845 SHA-1: d3eb18ee753a3eff0f69c5e9f4a261d11dfa5e13 SHA-256: 197453630fd6d82c4bdba79c43a321aa4f7e9657bbb0af1ac86b6d06091424b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically pointing to a URL containing 'apk money hack', suggesting a lure for potentially malicious software downloads. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inwebjor.ru/uplcv?utm_term=fs+16+apk+money+hack
    • http://cungcapbaoduongcuanhatban.com/upload/files/pufixuzefimowawegulijapa.pdf
    • http://stmrcstvm.com/userfiles/file/27478014027.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/fixajufufobi.pdf
    • http://ebd.su/UFD/7623/files/kuzabaxale.pdf
    • http://isvpro.com/custom/files/57932853165.pdf
    • http://edeins.com/userfiles/file/38770058205.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/buwodifivol.pdf
    • http://veterinariomauracotti.it/userfiles/files/91628309367.pdf
    • http://beveragesgs.com/userfiles/file/fusubulama.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355851a9a2e---jamijojonoboravidaserulo.pdf
    • https://shibbirs.com/media/files/62760066106.pdf
    • http://pribatu.lamilagrosaimport.com/images/files/vunutoxiraruritevusudug.pdf
    • https://iamtimeshare.com/userfiles/file/dabewexazupixobigefoxener.pdf
    • https://egyseg.eu/ckfinder/userfiles/files/gepilunuj.pdf
    • https://truonggiangcompany.com/userfiles/file/11555473109.pdf
    • http://exmar.it/foto_fck/file/75319814646.pdf
    • https://orcasproje.com/userfiles/file/63678616430.pdf
    • http://www.alfapilates.pl/upload/file/58576624466.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/29898807691.pdf
    • http://grupposcorcia.it/userfiles/files/fozejidi.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c0fdbe4e---67330837277.pdf
    • https://b2cexpressdemo.com/userfiles/file/fomilupunaxuwejekakani.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_off0000e028.bin
bf01a347916422df795bf322aad690a1d5ba33cf9ad141f0c41fde1ff78ac117		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE028 10708 bytes
font_01_sfnt_off0000f8a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 16792 bytes
font_02_sfnt_off000110b4.bin
56bb74e8bc907b49794d63bcb8f6184661e800843bebefb463cd38b9ef17de2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 17904 bytes

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