Malicious PDF — malware analysis report

Static analysis result for SHA-256 895179aa1003c03d…

MALICIOUS

PDF

89.4 KB Created: 2021-04-12 09:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd33617770a7c638143e974e31aff27c SHA-1: ba4c836779a2401aa1b042d42fdda4865960eb92 SHA-256: 895179aa1003c03d865791b8e397ed380e6874819d9d480dd4afa7c19da7f5bb
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 pointing to disposable domains or benign-looking sites that are likely part of a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.uts.cw/sites/default/files/webform/suvexaxobufakup.pdf
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/zajufofagobixipisuna.pdf
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/ranet.pdf
    • https://www.enwidth.com/sites/default/files/webform/resumes/95374483905.pdf
    • https://www.termis.org/system/files/webform/88699151804.pdf
    • https://ambrose.edu/sites/default/files/webform/xixarujopotagateregigo.pdf
    • https://natsihwa.org.au/sites/default/files/webform/46250275999.pdf
    • http://www.birdlifebotswana.org.bw/sites/default/files/webform/sightings-sketches/bikepekeroluxujopabiko.pdf
    • https://ambrose.edu/sites/default/files/webform/48232920683.pdf
    • https://aboss.by/sites/default/files/webform/8474239295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=arifureta+novela+espa%25C3%25B1ol+pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/wetesagepe.pdf
    • https://thesanfordschool.asu.edu/sites/default/files/webform/87767597376.pdf
    • https://minorsoncampus.princeton.edu/system/files/webform/libovonudipiguriteg.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b3b.bin
0cf2c01ccde7e297b3a1eaa4490071880bab16da8abae9df6ece2647e414bda8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 5296 bytes
font_01_sfnt_off00012d13.bin
14fe32cf1b535bd8204ee2633c705ebb8781657737541a9f08ff25eb685c1500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 12836 bytes

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