Malicious PDF — malware analysis report

Static analysis result for SHA-256 91cbc2b2b9908c90…

MALICIOUS

PDF

62.3 KB Created: 2020-12-16 17:24:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8ac34c1e91e1e9056149b66000be52f SHA-1: 8c15d8a8fad37caaf4bc726cb545e8f6aa8ab6b1 SHA-256: 91cbc2b2b9908c907826653df9bd440b7f11bc3ac4a081f7f567f23b24c583a1
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on platforms like Weebly and Squarespace, suggesting a link farm or phishing infrastructure. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8592

Heuristics 4

  • 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
  • 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://trafficel.ru/strik?utm_term=module+2+lesson+2+answer+key
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/tosedeg.pdf
    • https://fufivivol.weebly.com/uploads/1/3/0/8/130873849/f26647d.pdf
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/7489982.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8176c6db-96a6-4374-9dd9-e1d02e8deb1c/bivaxob.pdf
    • https://static1.squarespace.com/static/5fc51d3c5bcb0228a29dbe1f/t/5fc82b97e101942bf7666b2f/1606953880609/kuwosos.pdf
    • https://static1.squarespace.com/static/5fc06d09e5c7695ca9994347/t/5fc1395ee6d49a06bbbe907c/1606498654674/exodus_live_tv_apk_download.pdf
    • https://static1.squarespace.com/static/5fc50c755bcb0228a29d2b40/t/5fd6432d491a58544a0c9be4/1607877424313/16592899896.pdf
    • https://static1.squarespace.com/static/5fc0696cdf132613bbbb46ad/t/5fc27599e6d49a06bbe231bd/1606579610003/niguvojin.pdf
    • https://static1.squarespace.com/static/5fc599cf5e8e827d42add72c/t/5fcc13ffd336b863f0b0572a/1607209983844/texas_longhorns_basketball_roster.pdf
    • https://static1.squarespace.com/static/5fc506a3c30a162e0c6cfff4/t/5fd025263364176a12519dd8/1607476519627/vidaxawukidimelakinev.pdf
    • https://static1.squarespace.com/static/5fc689fec14dfd36fe18787c/t/5fcf51780496d067bdd072a2/1607422329401/face_masks_for_sale_made_in_usa_amazon.pdf
    • https://uploads.strikinglycdn.com/files/315d23f9-5bb3-4c86-90d8-259961fab795/59107234484.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81e.bin
ccd837637584b2df593cc89ff05eefa45072f11ab653bf306b0680ad6ffcd287		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81E 5212 bytes

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