Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73ddee5c77e063b…

MALICIOUS

PDF

71.5 KB Created: 2021-04-15 03:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d4b4591f47ee3bb1498a63734c6950fc SHA-1: f4d7d3f83f740fef07901582c9d905eafa010fc8 SHA-256: a73ddee5c77e063b15ce5dd849d2e6cc814be7038e62897106af34670e7e7048
126 Risk Score

Malware Insights

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

This PDF file was detected by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. The document body contains obfuscated text and references to external URLs, suggesting it is designed to trick users into downloading further malicious content or revealing sensitive information. The presence of numerous embedded URLs pointing to various domains further supports its role as a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.pacificsportfraservalley.com/sites/default/files/webform/joxelivoresilawefuxeli.pdf In PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/74795851198.pdfIn PDF document text
    • https://ambrose.edu/sites/default/files/webform/ginigiwosumomigari.pdfIn PDF document text
    • https://www.ofalloncasting.com/sites/default/files/webform/taxebuvokorutupimapo.pdfIn PDF document text
    • http://www.friendlycc.com/sites/default/files/webform/74296331991.pdfIn PDF document text
    • http://cicatsalud.com/html/sites/default/files/webform/99284441703.pdfIn PDF document text
    • https://www.uts.cw/sites/default/files/webform/nufideleze.pdfIn PDF document text
    • https://www.newburghgroup.com/sites/default/files/webform/resumes/talazeleravu.pdfIn PDF document text
    • http://oaklandchildcare.org/sites/default/files/webform/85322732160.pdfIn PDF document text
    • https://www.natsihwa.org.au/sites/default/files/webform/21073527915.pdfIn PDF document text
    • https://www.telluridescience.org/sites/default/files/tstc-applications/pagasumoxozodaxatukaliwus.pdfIn PDF document text
    • https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/27880179426.pdfIn PDF document text
    • https://web.liderpapel.com/sites/default/files/webform/dojoxopanikofogenag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+much+do+the+power+cast+get+paidPDF link annotation
    • https://ec.europa.eu/eip/agriculture/sites/default/files/webform/zuwamusijugowop.pdfIn PDF document text
    • https://ubmemeaensoprod.s3.amazonaws.com/ifsec_international/call_for_papers/2021/03/kizoromafogikigogusebef.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD924 5508 bytes
SHA-256: 94a98bbe890aee219efb9b4f4f69764ad8909367c4e95dda780af43f1869fb47
font_01_sfnt_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 10952 bytes
SHA-256: 7a1747a08e10e18d9b8b5ddfe7e7718ad93954be45312f487a5c994238ef4e28

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