Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f421906944cf74…

MALICIOUS

PDF

72.2 KB Created: 2021-04-15 21:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61b21885a0a70bc6974cd625cfadd22f SHA-1: cf219469447cbdeb288839677e40569417142166 SHA-256: e4f421906944cf74e796610a3125e6ce7b3521478b0006a3b31adc5e6c9213e9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting an attempt to redirect users to phishing or malware distribution sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the high number of suspicious links points towards a link-farming or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9424

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://cicatsalud.com/html/sites/default/files/webform/dozigax.pdf
    • http://spotlight-sites.com/sites/default/files/webform/sizewavajifur.pdf
    • https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/95133977644.pdf
    • https://www.mainephilanthropy.org/sites/default/files/guvobirewuge.pdf
    • https://www.a1touchsolution.nl/sites/default/files/jonalizavilivoduse.pdf
    • https://ambrose.edu/sites/default/files/webform/54125375098.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/96392425525.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=book+report+rubric+grade+5
    • https://lib.asu.edu/system/files/webform/dilitopuwivane.pdf
    • https://printandmail.princeton.edu/system/files/webform/83401752781.pdf
    • https://lib.asu.edu/system/files/webform/bidemuf.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a5.bin
61384808085ae86bc657b5d2f762940e9739f3e512189561f04e1a2ca1324228		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A5 5408 bytes
font_01_sfnt_off0000f61c.bin
d249b7a4008ea10b91d04c9c58200293048598b6c04ecf685770ceaa03047b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 11388 bytes

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