Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69e5b87a62d6153…

MALICIOUS

PDF

67.3 KB Created: 2020-11-26 04:56:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0062feb802206b741373edca7fa3350b SHA-1: 1d6ac4b4a1cba410d325cfb50fedab92b3f15b64 SHA-256: c69e5b87a62d61536526df99809ab236846e09fc97e434a4df043ebc1058978c
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting an attempt to direct users to potentially malicious websites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards a malicious document designed to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=waves+basics+worksheet+answers
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5f995d2b1606b.pdf
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fb2d20c9551a.pdf
    • https://jikuwizavu.weebly.com/uploads/1/3/4/8/134873999/wikuxinurorologak.pdf
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/filavikolotojipuxom.pdf
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5f970ba6bde23.pdf
    • https://cdn-cms.f-static.net/uploads/4422385/normal_5fb8bebc189e7.pdf
    • https://cdn-cms.f-static.net/uploads/4368481/normal_5fa66d4b54aaa.pdf
    • https://cdn-cms.f-static.net/uploads/4402014/normal_5f9b851929c8f.pdf
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5f9d26e0cbdaa.pdf
    • https://cdn-cms.f-static.net/uploads/4375356/normal_5fa4c61c18d11.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gavobawum/guided_meditation_for_mental_clarity.pdf
    • https://uploads.strikinglycdn.com/files/277627ea-a571-4c2f-a548-1ce5b5e35fa1/7447521470.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caac.bin
1c78ddc440e9c038b87ccfd74d3c2ee941f042afe67275a4d78054bd69e4728a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 5224 bytes
font_01_sfnt_off0000dc88.bin
cb790d90d9bed1dfe01e93d1fd74f0e1e67d4d248ea846cc2fd92a3e6cd9b773
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 10572 bytes