Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76cf8d537c97023…

MALICIOUS

PDF

52.6 KB Created: 2020-11-19 09:37:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 341cd5a6f3a2ed1dad98ca497c0c0f34 SHA-1: a6bc5f30ea1e8622596cb1699dd34a313ca334f1 SHA-256: a76cf8d537c970236cdce9198c91aa8801eb169306e317f8227970275845c128
212 Risk Score

Malware Insights

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

This PDF file contains numerous links to external PDF files, indicating a link farm likely used for SEO manipulation or to distribute further malicious content. One of the embedded URLs, 'https://ggtraff.ru/aws?utm_term=blister+in+the+sun+tab+pdf', is flagged as a known malicious redirector. The presence of these links and the ClamAV detection strongly suggest a malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9699

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/aws?utm_term=blister+in+the+sun+tab+pdf
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/c2126804ad26.pdf
    • https://cdn-cms.f-static.net/uploads/4444357/normal_5fa20130e238d.pdf
    • https://xumusiroti.weebly.com/uploads/1/3/4/3/134321309/xirubatelodik_tetufak_wuvuzikesar.pdf
    • https://ravadekivis.weebly.com/uploads/1/3/4/5/134512786/kodomugeje.pdf
    • https://xevubevisebu.weebly.com/uploads/1/3/4/7/134754503/gediwatadoxejubeper.pdf
    • https://cdn-cms.f-static.net/uploads/4370071/normal_5f94800112a09.pdf
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/vajos_kosumuwovemifig.pdf
    • https://cdn-cms.f-static.net/uploads/4447096/normal_5fb2cb3516366.pdf
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5fb5e154820da.pdf
    • https://xexinujufametu.weebly.com/uploads/1/3/4/5/134502762/dikujenew.pdf
    • https://litabunor.weebly.com/uploads/1/3/4/5/134522775/4456164.pdf
    • https://cdn-cms.f-static.net/uploads/4384817/normal_5f8fc1a5418fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/somamere/gifigofuvadar.pdf
    • https://s3.amazonaws.com/bidurudilidujug/amplifier_speaker_matching_calculator.pdf
    • https://s3.amazonaws.com/tawovojo/med_surg_notes_study_guide.pdf
    • https://s3.amazonaws.com/jobavo/20417479106.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c23d.bin
2b6e4a48ed2d9781e0f361018133c2d8608068b5333b9c58cfc1d0d5fd2157b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC23D 5316 bytes

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