Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c79bfc6a240e250…

MALICIOUS

PDF

63.8 KB Created: 2020-11-19 07:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3d7d6c3839d8d42a436b15e71b93cb8c SHA-1: b9951b79d3c8e6cef716597a0379bc75ee5531e6 SHA-256: 4c79bfc6a240e2507874d78a65471f72d3320d3f36c8c68efe1d9da31ce4e56a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://trafffe.ru/aws?utm_term=consecutive+integer+word+problems+worksheet+with+answers', appears to be a lure, potentially leading to a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/aws?utm_term=consecutive+integer+word+problems+worksheet+with+answers PDF link annotation
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/nunenemajewejawiki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373016/normal_5f8d938db61b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393489/normal_5fa44be3a3e7e.pdfIn PDF document text
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/fovoterawogisujaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427544/normal_5fa8a59fe9674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fb549b216111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366324/normal_5f88f66cb1d72.pdfIn PDF document text
    • https://sipasegeremiraf.weebly.com/uploads/1/3/4/4/134404187/1573a13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e916c924-ce4e-49c3-b685-c964c7adfd4c/inkscape_icons_too_small.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c005914-78ae-4d36-ba8d-b23eca4ae5a0/mass_effect_2_dlc_authorization_crack.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_off0000bcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB4 5748 bytes
SHA-256: 1cf94a278afcdc74da38a83b2fcbbdc5a6128b303358aa2aa4c602043130bba1
font_01_sfnt_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 9860 bytes
SHA-256: 11e5e72eb08a288686031d097e5ba4b988ab772b42dd542f8e1406814cb66be3

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