Malicious PDF — malware analysis report

Static analysis result for SHA-256 51847a949b8a8a01…

MALICIOUS

PDF

70.8 KB Created: 2020-12-29 23:56:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4510d1128574657b33798b769e3d936f SHA-1: 910acbc9f977852885682d16f7ecc19b16a614e5 SHA-256: 51847a949b8a8a01a82a2c1b180f2a8a8820b565503b90e08add1da27944adaf
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly random PDF files, suggesting an SEO spam or link farm tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffnew.ru/123?utm_term=the+imagination+of+disaster+susan+sontag+summary PDF link annotation
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/witoxutojewod.pdfIn PDF document text
    • https://cdn.sqhk.co/lelogusobade/cihte4P/80281190871.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/TPYLcuq/rolibixagobaked.pdfIn PDF document text
    • https://kowepesabileb.weebly.com/uploads/1/3/4/6/134635017/36878.pdfIn PDF document text
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/638b16b254c.pdfIn PDF document text
    • https://xebagaxasu.weebly.com/uploads/1/3/4/8/134878678/9443539.pdfIn PDF document text
    • https://jofufibiwew.weebly.com/uploads/1/3/5/3/135347649/25d229985416e.pdfIn PDF document text
    • https://cdn.sqhk.co/kiranagel/ohgklgg/90042377925.pdfIn PDF document text
    • https://wugovokida.weebly.com/uploads/1/3/4/3/134319073/goranesibazudi-jelikoga-lugura-jelowokod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/slope_stability_and_stabilization_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/93619214729.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/guidelines_esophageal_varices.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/1459835960.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_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 5340 bytes
SHA-256: 4b86f4f92ab24513694a4cb6a02d0e713e5d4f20d0c9a46d120461a93918761f
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 10732 bytes
SHA-256: f5c7893a1640474afe74965c7c09f03daf4645511d263564529ee630a114288c

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