Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47b8fe63b797885…

MALICIOUS

PDF

68.0 KB Created: 2021-04-25 06:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d62e3314d3d4cf6bcd58ac62ad54863e SHA-1: 2c04e62b95097a962782fce4e97d563d8c2548ce SHA-256: e47b8fe63b79788506220a34624b9efbf47a6ed8ea02013cab58f67069d5cbe5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting an attempt to redirect users to malicious sites. Although no specific script content was detailed, the presence of embedded URLs and the PDF structure strongly suggest an attack pattern involving spearphishing attachments designed to lead users to compromised or malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.blplegal.com/sites/default/files/webform/80507347088.pdf
    • https://www.pharoxglobal.com/sites/default/files/webform/balulata.pdf
    • http://pilgrimland.com/sites/default/files/webform/resume-uploads/64296936159.pdf
    • https://www.telluridescience.org/sites/default/files/tstc-applications/kuvusuwube.pdf
    • http://russian-ice-spb.ru/sites/default/files/webform/files/loxigexaxezirizedud.pdf
    • https://www.natsihwa.org.au/sites/default/files/webform/welukugipevodabarovefeweb.pdf
    • https://natsihwa.org.au/sites/default/files/webform/filon.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/37570077738.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/bemefunojupupik.pdf
    • https://www.mainephilanthropy.org/sites/default/files/5296457674.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=diary+of+a+wimpy+kid+deep+end+review
    • https://community.princeton.edu/system/files/webform/fivedexexefo.pdf
    • https://community.princeton.edu/system/files/webform/vujipudujusikal.pdf
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/27560642257.pdf
    • https://gradfutures.princeton.edu/system/files/webform/25860956451.pdf
    • https://www.healthdata.org/sites/default/files/resumes/sutuzosugogaw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d18a.bin
a441f2ca2c188fd5d4492201d42397dd898577390852294573a50cf6f128a0ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD18A 5296 bytes
font_01_sfnt_off0000e3a5.bin
14c7799af964898ffc6293fabe706b705118bfb9e2e50c8bda6c0aeb8cebd14d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 10940 bytes

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