Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5cf8a7987cad5a…

MALICIOUS

PDF

86.2 KB Created: 2021-09-22 09:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 53db2216c90814b11e93da053f496ee1 SHA-1: 6d2e221991a2f2c193f8d7b3fe0501070b22cc8c SHA-256: 5e5cf8a7987cad5aefae56e04a9805ffb81baa7fdfdac716febd8e6c58f47d5d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URIs, with a specific heuristic identifying it as a link farm on disposable hosting. One of the embedded links points directly to an IP address, which is a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://soft-pro.hr/upload/datoteke/83688712291.pdf In PDF document text
    • https://zerling.eu/nico/images/files/pemafe.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/91207273763.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/nelogomexabinix.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/85487783566.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/genogofowasa.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/87859625584.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/vorisade.pdfPDF link annotation
    • http://svb-volleyball.de/userfiles/file/41569157411.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/wapugarosib.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/juditewopes.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/zeruvowilugoronimuvon.pdfIn PDF document text
    • http://netflor.pl/upload/File/dubewised.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/906b9757ad02716940ddc1adad6343cf/65151415115.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/fupafuxi.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/3254191861.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/83327700596.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/5426910865.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/95ifhaurl2h9262siuhkip54vm/pinuduregopapotolotutafu.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-19/20210919225840107897.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210913_AA7E4BE27B80749F.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=new+online+movies+2021PDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/besatoredepilu.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_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 10332 bytes
SHA-256: bcd8cd67d9319660561e685b685862e287c74c5d6a7957c37140201943a0fbcb
font_01_sfnt_off000100f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11908 19224 bytes
SHA-256: c380bd4d9da055f99b6da6bbf1d57e4d0a09f3865825244f77172ec8081cb0e1