Malicious PDF — malware analysis report

Static analysis result for SHA-256 673f292f709c1d3c…

MALICIOUS

PDF

80.3 KB Created: 2021-06-14 22:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5964d2a706923dbbba93e4252b200547 SHA-1: 6a22dff5658bfc28b1cc889edc9693ef1c3589dd SHA-256: 673f292f709c1d3c3db7a766a1a1892ebed48e7a5bedd5fcc79274d073635bc1
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a large number of outbound links designed to manipulate search engine results or redirect users to malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7994

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://inwebjor.ru/pbw?utm_term=annual+maintenance+contract+template PDF link annotation
    • https://mawikimame.weebly.com/uploads/1/3/4/2/134235565/zapofidenibilip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fd055810f45f.pdfIn PDF document text
    • https://xajevopo.weebly.com/uploads/1/3/2/6/132682124/5498351.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_606d9f51d2779.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379611/normal_60afe8ebc6510.pdfIn PDF document text
    • https://sewogasi.weebly.com/uploads/1/3/1/1/131163712/jatusekuberusam.pdfIn PDF document text
    • https://kezorida.weebly.com/uploads/1/3/5/3/135330530/ditivixeteg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_60616aff72403.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388428/normal_605f371eb20ea.pdfIn PDF document text
    • https://bonitolopulako.weebly.com/uploads/1/3/1/3/131384654/3704610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390642/normal_60c0ba2693699.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5ff567f04246b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367643/normal_5fedc8e42307d.pdfIn PDF document text
    • https://xijegubusogo.weebly.com/uploads/1/3/0/7/130739006/galogewisoz.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/d70e5f24-0281-4385-ad5a-73eb2042ef61/90567754565.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a703b78-c275-43f9-911e-be85233466f8/kudupuroduvatan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7009a94-de6e-4fd8-b930-7a579187b196/lg_refresh_rate_conversion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0484c38-2ed1-4de3-a724-046d1a190985/86187875858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6714f3-6f9e-450a-b47d-4d7474c0108f/des_vermis_mysteriis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbeb6c8-8265-44fc-bf2f-e6a4cfe687cc/beretta_92_ltt_compact_review.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 4892 bytes
SHA-256: ebf9b1b462e3d3f328731f0a3dc2818037884c9b7e7c79dde1df19170f4ca150

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