Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c1ac763e04c3b2…

MALICIOUS

PDF

71.7 KB Created: 2021-02-03 18:45:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b9bad5afff01212f3057a5915b775fc2 SHA-1: 9f098aeb698fba0f316cb8cb615f005ced2b255e SHA-256: 03c1ac763e04c3b2f6e3909c1c33ef1f27d0de87c6ac8cf25d6119cdaabff3d2
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 of which are to SEO-farmed content, indicating a likely attempt to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of numerous external links points towards a phishing or spam campaign.

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 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://baarspo.ru/123?utm_term=eras+of+federal+indian+policy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494138/normal_5fe3ea5564887.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5fedf247d3421.pdfIn PDF document text
    • http://fulusixavopowem.iblogger.org/contour_guide_round_face.pdfIn PDF document text
    • https://dalenorilesa.weebly.com/uploads/1/3/4/8/134858788/latisipifa.pdfIn PDF document text
    • http://gixotakopopunod.22web.org/bollywood_movies_old_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fd1e1e5a6ba2.pdfIn PDF document text
    • https://fepafevadaxajaw.weebly.com/uploads/1/3/4/0/134095897/d45fcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_6016e84b01934.pdfIn PDF document text
    • https://xesusilinani.weebly.com/uploads/1/3/0/8/130874458/lutofedumixapiv-kinumudolozi.pdfIn PDF document text
    • https://tizitumobupo.weebly.com/uploads/1/3/4/9/134904485/6145269.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/kexamoxusinixu/xifizopuvegipe.pdfIn PDF document text
    • http://kezitiw.epizy.com/90575835354.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/22149116057.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/37554798181.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/relexazofal.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_off0000da8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8A 5208 bytes
SHA-256: 344a472332f802b3f13b148abf028ed5178bd57201aff2fa4280c114faa088ca
font_01_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 11032 bytes
SHA-256: bd0d81e028b900b02ce8849594a334a6f14e7198e07133df296b0b1b9b179287

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