Malicious PDF — malware analysis report

Static analysis result for SHA-256 3620ca12a047cc80…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 02:40:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8a04384bd3e1e2c8a2cba6e644b3557 SHA-1: b5633bc5a2d486f2afbcf3c5677fc8c829f665ea SHA-256: 3620ca12a047cc8064fb057c9aa46e977ffa878d2d6b7e707dadc273817b5781
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The PDF contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate potential for malicious actions such as redirecting users to phishing sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=how+to+trade+forex+in+south+africa+pdf
    • https://static.s123-cdn-static.com/uploads/4380384/normal_6007f1eb97c65.pdf
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/46c83.pdf
    • https://cdn-cms.f-static.net/uploads/4367301/normal_601e92aa7abf7.pdf
    • https://cdn-cms.f-static.net/uploads/4416139/normal_603befcfd397e.pdf
    • https://static.s123-cdn-static.com/uploads/4470399/normal_5fe00578b0cfe.pdf
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5ff69332e618a.pdf
    • https://cdn-cms.f-static.net/uploads/4444850/normal_604bbbdbc5bd4.pdf
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/2954392.pdf
    • https://fukusegoboviv.weebly.com/uploads/1/3/1/8/131856281/nikikakijo.pdf
    • https://wubugivaruj.weebly.com/uploads/1/3/4/6/134669137/7572808.pdf
    • https://cdn-cms.f-static.net/uploads/4493550/normal_601dbef601e54.pdf
    • https://cdn-cms.f-static.net/uploads/4460247/normal_5fe9ca120fd78.pdf
    • https://cdn-cms.f-static.net/uploads/4445101/normal_602830e9ba64a.pdf
    • https://folowobudeguw.weebly.com/uploads/1/3/6/0/136051819/9288724.pdf
    • https://cdn-cms.f-static.net/uploads/4461483/normal_5fda05f9bcd91.pdf
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/sonida.pdf
    • https://tebideronapiza.weebly.com/uploads/1/3/1/4/131483209/5998358.pdf
    • https://cdn-cms.f-static.net/uploads/4410730/normal_60370269860c5.pdf
    • https://bowonalixatan.weebly.com/uploads/1/3/5/3/135347428/murejolir.pdf
    • https://cdn-cms.f-static.net/uploads/4382189/normal_600c8029897d8.pdf
    • https://cdn-cms.f-static.net/uploads/4418970/normal_602792b55b5cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vokeri/business_letterhead_template_free_word.pdf
    • https://s3.amazonaws.com/gogunabones/96008747043.pdf
    • https://s3.amazonaws.com/vuterijoze/ms_excel_advanced_functions.pdf
    • https://s3.amazonaws.com/dowesitobuga/playmobil_5167_my_take_along_dollhouse.pdf
    • https://s3.amazonaws.com/retisovojor/45518237652.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_off0000f0f9.bin
f37271878e0a0ea318e1b76a28f7b25529646c667228aa57f19358282fe7895c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 5332 bytes
font_01_sfnt_off0001032f.bin
4f6c85ff5a78a2ef04cf48d12e7f31ce4c40da5c4bc31f72c771d910aa081187
pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 11104 bytes