Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7be9c30093988ae…

MALICIOUS

PDF

68.4 KB Created: 2020-12-10 06:51:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b05dccc9498222dc487fffd3ce348360 SHA-1: 3da892f90d725df1781981dd53c3b61176727280 SHA-256: d7be9c30093988aee393bf4314912e8f23912d9c96c61dac53823c931143a3fb
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffking.ru'. Additionally, it exhibits a PDF SEO link farm heuristic, indicating a large number of external PDF links, with 's3.amazonaws.com/xutomoxu/assetto_corsa_bihoku_track.pdf' being one of the first identified. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojan distribution attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/strik?utm_term=metaphors+in+suicide+note+by+janice In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5fb73dbbd803f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fada253b49b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461245/normal_5fbf12b429c6d.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/abceea6b36.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/govasuludixerubif.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/xutomoxu/assetto_corsa_bihoku_track.pdfIn PDF document text
    • https://s3.amazonaws.com/befevifa/dengue_management_guidelines_2018_india.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e9eb3398ff75152e2002/t/5fc50a354f983757207de8df/1606748727148/97694675036.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/16052464912.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/jurassic_world_fallen_kingdom_sub_indo.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/mopanujijilejoguv.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_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 5452 bytes
SHA-256: 0ffda3d830dd8620252a3dbcfe7cb84e2d564e658b7e48c48f164d2442fea6b3
font_01_sfnt_off0000e24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 10368 bytes
SHA-256: 16ccb6ad5880ef850173f045944140f3c4bd03dc207691265f8a15e9f81fa5af

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