Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddaca625f637e364…

MALICIOUS

PDF

71.4 KB Created: 2020-12-15 16:09:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2953e287fc2e32d84954debc36bb702c SHA-1: 1f68d9ce0fc1a1aadbbbaf7c066ee6845c589f5d SHA-256: ddaca625f637e3649e424546fadbe4f60f746a4c42561310dd13f51ebead4ea4
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=tower+of+the+gods+guide
    • https://cdn-cms.f-static.net/uploads/4374520/normal_5f8d05af2c4a9.pdf
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/4827796.pdf
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/fegoxalikud_nujekifevazas_mivubibo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/widetunipet/misefojavonopadomejug.pdf
    • https://s3.amazonaws.com/fejatepudopito/92266289738.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/javatisifenin.pdf
    • https://s3.amazonaws.com/nuxomigo/38172536423.pdf
    • https://s3.amazonaws.com/tiluwisulepam/17198161318.pdf
    • https://s3.amazonaws.com/liguwubore/adobe_acrobat_pro_dc_ipad.pdf
    • https://s3.amazonaws.com/sugosubexez/90152262151.pdf
    • https://s3.amazonaws.com/satulibaren/rsos_admission_form_date.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_off0000dcd6.bin
3d38dc850370b8faf0ed93bb0cf0cafdfb1b9c1274a6a505861dc6ee52adabd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD6 4968 bytes
font_01_sfnt_off0000edcf.bin
4d4c95e36c35f139bbcb3369a0318045ea8d18ea6733334cdf40897dc6c34061		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 10528 bytes

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