Malicious PDF — malware analysis report

Static analysis result for SHA-256 f168ead7ca66efc4…

MALICIOUS

PDF

68.0 KB Created: 2021-04-07 00:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c9983385213906c0973277904c1fb7f9 SHA-1: 267f907644e9672964856260ba1726396835ff91 SHA-256: f168ead7ca66efc4a067dd7099e913dd437ef127a63356d0f557057e932f1984
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 Weebly-hosted PDFs, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=math+solution+synonym PDF link annotation
    • https://guwevene.weebly.com/uploads/1/3/1/4/131437413/4889450.pdfIn PDF document text
    • https://losasogewago.weebly.com/uploads/1/3/1/4/131437886/dowaxalo-tosuvela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_60162834c11b7.pdfIn PDF document text
    • https://mekasirizi.weebly.com/uploads/1/3/5/3/135325166/50bf8571d745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498645/normal_603ff22a7bd9d.pdfIn PDF document text
    • https://lexikusu.weebly.com/uploads/1/3/1/4/131438729/bukalos-vafudutob-zarur.pdfIn PDF document text
    • https://bolubevegu.weebly.com/uploads/1/3/1/4/131454373/zifureb-zulixovifori.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_5fe8c4d8be984.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377928/normal_6007af5bb3916.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/pogoxiwotom.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/91ccd7223df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384029/normal_5fff533c946a2.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/pevarijidasalop/dovuv.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/30756357764.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/87468552231.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/nujisoropavesav.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/bigger_leaner_stronger_book_depository.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/56384261022.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/kibekawavo.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/2018_acura_mdx_hybrid_owners_manual.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_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 4936 bytes
SHA-256: 184faab1520db058cf1608c4ff0441e9120a6848668a594ff0ea8ebcae65f431
font_01_sfnt_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 11468 bytes
SHA-256: df80ce20f343a5893ae7266495b140057be7a766a7e47b281aa10af0ef489d46

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