Malicious PDF — malware analysis report

Static analysis result for SHA-256 b103fc6164796797…

MALICIOUS

PDF

68.6 KB Created: 2021-05-26 19:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae2f7bf1b1d06774a9071817649b8475 SHA-1: 602065aa8b2b6402cc6a499a54d6d3bfa3d9cfda SHA-256: b103fc6164796797437f38f2dabf571149f0ca2eb146edb33119663e5cbadd97
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 link farm domains, indicating a potential phishing or malware distribution scheme. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://golowaki.ru/strik?utm_term=is+fancy+feast+wet+food+grain+free
    • https://cdn-cms.f-static.net/uploads/4382208/normal_6045f42a1c1b4.pdf
    • https://nubegajal.weebly.com/uploads/1/3/4/6/134668927/196657.pdf
    • https://botekajerojaj.weebly.com/uploads/1/3/4/7/134749353/4723607.pdf
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/waweva.pdf
    • https://xijoxipuxob.weebly.com/uploads/1/3/4/7/134704834/xitomos-meruxa-letofaxupowenux-gisix.pdf
    • https://zegojigonixuw.weebly.com/uploads/1/3/4/6/134631084/sesetisib.pdf
    • https://ranepudanaliv.weebly.com/uploads/1/3/4/0/134000181/6151093.pdf
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/1723333.pdf
    • https://cdn-cms.f-static.net/uploads/4477409/normal_5fe872aa66357.pdf
    • https://bisojobiregabo.weebly.com/uploads/1/3/4/5/134509607/4081794.pdf
    • https://cdn-cms.f-static.net/uploads/4367923/normal_6054c95dc53fd.pdf
    • https://static.s123-cdn-static.com/uploads/4450424/normal_5fcc5aa78ad20.pdf
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/xelabed-wifovari-lefasafuse.pdf
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/8210037.pdf
    • https://silavetej.weebly.com/uploads/1/3/5/3/135314504/2828203.pdf
    • https://dojinutek.weebly.com/uploads/1/3/4/1/134108596/telugej.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_6056188edfcb7.pdf
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/zubedaw.pdf
    • https://xofilovinavi.weebly.com/uploads/1/3/1/3/131379248/76a5644ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f694.bin
e38cde9c324238c373716e6d0acb2b481d05681114e2166b5c11bb4078bccbd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF694 5288 bytes

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