Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a2c1eb68533d07…

MALICIOUS

PDF

76.3 KB Created: 2021-03-12 13:33:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0248c25d4fa3ec299166d1cf38d78149 SHA-1: 9ea546ae5bbeac2bdbc6b6866be7d9c59e46f71b SHA-256: b3a2c1eb68533d0751757e33ae7cb3a9a8dd4d4b0df94d017e2a8962adf410ac
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 of which are likely part of a link farm designed to improve search engine rankings for specific keywords. One prominent URL, zajinet.ru, is directly linked to the document's purported topic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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://zajinet.ru/award?keyword=cctv+installation+training+pdf+in+tamil
    • https://static.s123-cdn-static.com/uploads/4475397/normal_5ff4c28f03a9b.pdf
    • https://static.s123-cdn-static.com/uploads/4421048/normal_5fc70db41e1a6.pdf
    • https://cdn-cms.f-static.net/uploads/4383928/normal_601f1d668293e.pdf
    • https://static.s123-cdn-static.com/uploads/4393751/normal_5fccd14a7448b.pdf
    • https://cdn-cms.f-static.net/uploads/4419849/normal_601c61a097a41.pdf
    • https://duludeda.weebly.com/uploads/1/3/4/7/134754074/2199193.pdf
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/c260ff.pdf
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/640cc4b0b970.pdf
    • https://wavinibavuma.weebly.com/uploads/1/3/1/3/131398010/jizowusigexiwod_tugibedupolo_wamuxulerurek_gewagikog.pdf
    • https://cdn-cms.f-static.net/uploads/4411252/normal_600f15dd31fd7.pdf
    • http://totalcreditcheck.info/lipimiwsxzud.pdf
    • http://theharaka.online/make_face_sketchup_2017_free_downloadaqi7d.pdf
    • https://cdn-cms.f-static.net/uploads/4481423/normal_603979a723dc5.pdf
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/1102345.pdf
    • https://cdn-cms.f-static.net/uploads/4486354/normal_60464870304c2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a22049ac-c643-499b-bdbb-a13b72a84f27/siramedefuviw.pdf
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_7b6972bb7fd44d868de9edf797579974.pdf?index=true
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_1f1acb51043f4e16b1c75e8d68daf6fc.pdf?index=true
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_3d3c45367c5d4441b732145d3fdd73cf.pdf?index=true
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_211c6478fd5c4ce383480d402b5d0e1f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f15f575d-a081-4dcd-a156-a6e14d61ee87/english_speaking_classes_brisbane.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011466.bin
12f68ad3084ac69b9232a447b2aabfa25beb14fbb1bfa89a6457896fe4cc7d0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11466 5228 bytes