Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f1eb861d9e5ece4…

MALICIOUS

PDF

65.7 KB Created: 2020-11-22 00:00:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8c03342a0ff4cc361cfb354d51234db2 SHA-1: 1aeef255f93f9bf5a0d05c914c1a7db92510e9b3 SHA-256: 3f1eb861d9e5ece4c62b893e64bcf77eabc062fae2e72adde4c9587034488183
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The primary URL, https://trafficel.ru/aws?utm_term=cahier+des+charges+pour+application+informatique, suggests a potential phishing lure or a redirect to malicious content. The PDF structure and embedded links indicate an attempt to direct users to a network of external sites, likely for further exploitation.

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://trafficel.ru/aws?utm_term=cahier+des+charges+pour+application+informatique PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f914efe34db7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369336/normal_5f9080557c6be.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/wuropu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470017/normal_5fb3da4ec19f9.pdfIn PDF document text
    • https://kigekasomek.weebly.com/uploads/1/3/4/5/134598498/lezotutigupiko.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/5b8bf3948c1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f883011b8485.pdfIn PDF document text
    • https://nukevokisoget.weebly.com/uploads/1/3/2/7/132711970/8822636.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/bazarerin-surilugajexu-jusibut-jopaxig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5fa0eab09c9c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_5fafe9df1390c.pdfIn PDF document text
    • https://jomojakadawubo.weebly.com/uploads/1/3/4/4/134448567/2c9eca2a54.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC143 5600 bytes
SHA-256: 742388c941cf9e915e1efc2145d7e4d407d406cf3e0cb24691ca81ee6887ca69
font_01_sfnt_off0000d41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41D 11420 bytes
SHA-256: b42664b7562521aa879d788b2a34ba5957f2d7361a194c82632dd315bd18d14e

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