Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31ad547b27c7630…

MALICIOUS

PDF

95.3 KB Created: 2020-11-24 05:34:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 561263d793c545a3aeba53ac531bdebc SHA-1: 7314e27ec57307d6210fab48f2351f1d98857c92 SHA-256: d31ad547b27c76306c40a2cfaf2474a136ccdd87e7fce99720e4fbb07e1e68ae
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, including a primary link to 'trafffi.ru', which is flagged as suspicious. Heuristics indicate a PDF link farm and ClamAV detection as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, appears to be a lure related to 'Siddhartha Hermann Hesse PDF' and mentions the wkhtmltopdf application, suggesting it's a crafted document. No scripts were extracted, but the overall structure and URL suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://trafffi.ru/strik?utm_term=siddhartha+hermann+hesse+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5fa5dfed41bbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5fa0142e8e8eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413702/normal_5f9b63fa6d3db.pdfIn PDF document text
    • https://ranuxibat.weebly.com/uploads/1/3/4/5/134595997/4001667.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/bageraxu_fapanowibusoga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426090/normal_5f98524970d6f.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/devuxuzejozam/singer_embroidery_machine_software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2177dae7-acab-4ceb-9980-b81152b422ee/54493975837.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/contraction_words_worksheet.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 7012 bytes
SHA-256: 4a57c0b64f3f5fcf5bc0b2a24208326834a842fc869666667b155c5d5e1ba739
font_01_sfnt_off00013432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13432 5352 bytes
SHA-256: 9b11da5793516a658cd909cc55c44174e40e161bfed312459c48e79c1c05dc0e
font_02_sfnt_off0001463a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1463A 13056 bytes
SHA-256: 5559325a7fcf6b1ad6420f62bdce0cb74e68561fa6014ce4125df1501f2bff9f

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