Malicious PDF — malware analysis report

Static analysis result for SHA-256 0395ac801471096a…

MALICIOUS

PDF

66.1 KB Created: 2020-12-17 11:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0f801f369c00540000880770d4a53b06 SHA-1: c30a1cc5668dfcf64420afae3d42c1c25fe7a455 SHA-256: 0395ac801471096ac03d4926e55eca6e62ee3b60f046ba71b5c8e98458bb096a
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or distribution mechanism. One of the extracted URLs, 'https://trafftec.ru/123?utm_term=water+right+hose', is likely part of the malicious infrastructure. The presence of PDF_SEO_LINK_FARM heuristic indicates a deliberate attempt to create a link farm within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=water+right+hose PDF link annotation
    • https://zipuwuxa.weebly.com/uploads/1/3/4/3/134376087/21be1260db1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413697/normal_5f9cab982b2e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476941/normal_5fb5dc5f3e666.pdfIn PDF document text
    • https://zotujovub.weebly.com/uploads/1/3/4/3/134354671/6865987.pdfIn PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/tulezekuraves.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/ganubatebedoxez/57891217701.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/zuvutogizosepizevi.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/7097607540.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/storyboard_template_16x9.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/87633288381.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/92194158762.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/english_words_starting_with_v.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/jerozokogefaboveg.pdfIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/bowotukuwolilagoxop.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/67976101777.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_off0000c83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 4928 bytes
SHA-256: aeb61b4b6027585c88af336053942879abcee6aaa447464c2a8bda0549806ee4
font_01_sfnt_off0000d904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD904 10292 bytes
SHA-256: dae8da30347ed7df0718632eacaabcafa379b46f8bf8c771eee71895c4aaaaa2

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