Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c30074a9fe2630…

MALICIOUS

PDF

78.3 KB Created: 2021-01-14 08:59:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8e1fc9064aa36c4dd2e7a9de8e505ba2 SHA-1: b6d8ea6f669bb2a5e0af2d69b9966837fa2c618e SHA-256: c3c30074a9fe2630e1d22a560099eb4651ffdf590a9b90a467e49688992bcb79
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with the primary lure being a guide on writing legal briefs. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, suggesting a link farm or phishing operation. While no scripts were explicitly extracted, the presence of external links and the overall detection pattern strongly suggest a malicious intent to redirect users to potentially harmful sites.

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://trafficel.ru/123?utm_term=how+to+write+a+legal+brief+for+students PDF link annotation
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/ebd8ce7c.pdfIn PDF document text
    • https://ridogorizaloliv.weebly.com/uploads/1/3/4/5/134527302/rakevelulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377112/normal_5fba10ecba46f.pdfIn PDF document text
    • https://nigafabap.weebly.com/uploads/1/3/4/3/134377596/lonuzan_mogowegog_kurijabuki.pdfIn PDF document text
    • https://pikupazu.weebly.com/uploads/1/3/4/5/134577858/roxufugefu-diluzexa-gilekozezesaru-bavipara.pdfIn PDF document text
    • https://totelulipax.weebly.com/uploads/1/3/4/4/134469391/1386129.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/dazifozixawus/54686924342.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/delay_and_sum_beamforming_matlab_algorithm.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/google_chrome_app_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/borg_warner_model_8_automatic_transmission_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/88516891971.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/email_template_for_requesting_time_off.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_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 5268 bytes
SHA-256: 108b9467cd1b51501c937fdfed80c7884b43a1e2296f98fbf722a8f28dc5836f
font_01_sfnt_off0001081e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081E 10632 bytes
SHA-256: 0509f68fa96390fc2712b086f36cec0ba247157ad3e0c819977d1c97bf4e9b6c

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