Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ece415bf12f7a9f…

MALICIOUS

PDF

74.3 KB Created: 2021-03-12 20:57:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d8f0e2c85ed26717dd64fc936f89559 SHA-1: cc89fad48f1dae9bbaf750909cc085c2067f0321 SHA-256: 2ece415bf12f7a9fdb7a8ed19b35b3f29f0f4efca938e9e49d2e6d7bf0b12b72
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate an attempt to direct users to potentially harmful content.

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://crophysi.ru/aws?utm_term=somewhere+over+the+rainbow+ukulele+chords+original
    • https://static.s123-cdn-static.com/uploads/4498842/normal_5fe3b805c112c.pdf
    • https://static.s123-cdn-static.com/uploads/4446398/normal_5ff29dbabccea.pdf
    • https://cdn.sqhk.co/fuvazuginu/ajRnQqm/62411270916.pdf
    • https://rorupuloloxotog.weebly.com/uploads/1/3/1/4/131409755/5406286.pdf
    • https://walazufa.weebly.com/uploads/1/3/1/3/131383665/vibanejufegij.pdf
    • https://cdn-cms.f-static.net/uploads/4369304/normal_6027fd0094e9b.pdf
    • https://cdn-cms.f-static.net/uploads/4405895/normal_603ea8821f585.pdf
    • https://cdn-cms.f-static.net/uploads/4369919/normal_6046ec0ee1be7.pdf
    • https://cdn-cms.f-static.net/uploads/4406775/normal_5fe63323820cc.pdf
    • https://static.s123-cdn-static.com/uploads/4501229/normal_5ffc9a9608c19.pdf
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5ff39003e099f.pdf
    • https://cdn-cms.f-static.net/uploads/4490725/normal_6029cba664990.pdf
    • https://cdn-cms.f-static.net/uploads/4481271/normal_6023f49b5c8f4.pdf
    • https://cdn.sqhk.co/doporaba/Qiekidi/61461507974.pdf
    • https://cdn-cms.f-static.net/uploads/4448744/normal_601ff2de56039.pdf
    • https://cdn-cms.f-static.net/uploads/4380682/normal_5fdc01d83304a.pdf
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5ff3886157902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e30d.bin
2800d70294166a68021395a8dfaabbbb371fcc8cde675a10509f5810d18ce44c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 5812 bytes
font_01_sfnt_off0000f6b7.bin
e78e56830ec3eed865aa53b07e3396c2d2318e315d6a0e07a94ac865c0d90890
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 11084 bytes