Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d81bea0cdd87b7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-20 22:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07a11b8f79e7beed240e9f63c5205cd3 SHA-1: 66fa898506793d4aaa5ab23e776522156aa8c156 SHA-256: c5d81bea0cdd87b77d7a2cdc94e220c38563cc3aeb029accf2e605bab1246d28
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by heuristics as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=snake+and+ladder+plus+apk+old+version PDF link annotation
    • http://sportingfoundation.com/uploads/file/47156526807.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/notisa.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/tetanax.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/saxinoxepemanupavepalo.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/57776166515.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/55031271844.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/uljkh8vcocs8naqmk3svhb9ji0/8226827226.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109081509132415.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/50379089155.pdfIn PDF document text
    • http://rsst77.ru/upload/files/meruzamodazipupo.pdfIn PDF document text
    • https://andana.us/files/files/nunipujokamopubekazur.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/92341842487.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/9451235949.pdfIn PDF document text
    • http://erimti.com/userfiles/file/fukamufizizapufuw.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210903084448.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/28258972099.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/26947064614.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/87123840978.pdfIn PDF document text
    • https://esz.jp/img/editor/files/62469290522.pdfIn PDF document text
    • http://restokrat.info/userfiles/file/dunewimerajukaxafeket.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/rutupu.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/momamavesajojojuruvagute.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/28130711884.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_off0000b41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC31 10620 bytes
SHA-256: 66f8787e9b4232b4836a95fb03ccc60cebeb3575ebd9cf5b74dac01a558cbf3e
font_02_sfnt_off0000e488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE488 15360 bytes
SHA-256: 987cc940d7dfe0c185c9199348ae79cdcb96bebccfce078ee01b8d5da3b3860e

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