Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bd2d788d0a8efc…

MALICIOUS

PDF

79.0 KB Created: 2021-09-11 18:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 334a34b343d96d3c8d4c32330b89a144 SHA-1: ad3ee6f1e0664ce62ecade630bc116cdf18247ef SHA-256: b8bd2d788d0a8efc20a395dec4a1c1533d8438cd3bb97b2622d0ac6871590924
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://coretry.ru/uplcv?utm_term=adb+fastboot+commands+to+flash+recovery PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddc8d7e84---37392521437.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/vagufikotovifibupagosinir.pdfIn PDF document text
    • http://orthodoxnews.us/file/ralilavalagufipas.pdfIn PDF document text
    • https://steammining.com/userfiles/file/17926909540.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/44907265188.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/53149211318.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/koluvupadodewa.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/28710666808.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210911035801.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/50339668109.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/lidas.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/64e08c16cdd6b643cee2aafc426630fa/diwokuvufodaxiwo.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/5879184676.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_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 17196 bytes
SHA-256: f89c995994d4a1f0ecb994754acabd4e84fe3a71983ec12943e953c3ac897e95
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 10948 bytes
SHA-256: d795b365beb79ecd203063823ff157335dae70d3e3f07e71d0894f2d2daf3a23

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