Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de21d3d70e41a86…

MALICIOUS

PDF

65.6 KB Created: 2021-05-22 10:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3404d4877baa0bb1edd86b3c6f49b2c SHA-1: e99452a050a5c6d621b0c5342c5b6c8ec66a545d SHA-256: 2de21d3d70e41a8689dde3c020cfa1fd52edfeff0ecbe3a2f925e324f46b4df1
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 potentially malicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8603

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=como+calcular+las+dimensiones+de+un+rectangulo+con+expresiones+algebraicas
    • https://jokasagumejede.weebly.com/uploads/1/3/1/0/131070006/tolejivizarop.pdf
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5fd61a41bef21.pdf
    • https://static.s123-cdn-static.com/uploads/4419235/normal_60034fe8ef137.pdf
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/kavezurina-jikilovun-mawiled.pdf
    • https://kuxadituva.weebly.com/uploads/1/3/1/3/131380841/pegog.pdf
    • https://cdn-cms.f-static.net/uploads/4449181/normal_6025dd3bd982f.pdf
    • https://cdn-cms.f-static.net/uploads/4467586/normal_605285d9893c0.pdf
    • https://ragitodis.weebly.com/uploads/1/3/4/7/134753297/fa269.pdf
    • https://static.s123-cdn-static.com/uploads/4476302/normal_60078c451eee4.pdf
    • https://static.s123-cdn-static.com/uploads/4405922/normal_6003ed372e9a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f5daedee-f8d4-41fc-85df-555c09046da4/rizowo.pdf
    • https://uploads.strikinglycdn.com/files/68fcfbdb-7f8c-4388-ad8a-7fd0a6ac3dd5/the_united_states_military_academy_band_army_song_lyrics.pdf
    • https://uploads.strikinglycdn.com/files/3e888503-ac26-49d9-8e7e-a4b614a1aa56/sanagifobewakupexa.pdf
    • https://s3.amazonaws.com/goveruduzewoxu/prismatic_compass_survey_report.pdf
    • https://s3.amazonaws.com/didowugorokirug/sanolola.pdf
    • https://uploads.strikinglycdn.com/files/16156519-3cf0-41d2-8c2e-fc3b31be4071/70529846597.pdf
    • https://uploads.strikinglycdn.com/files/fe9431ce-981c-4dc5-b328-1dca47ba65cb/schaums_outline_introduction_to_mathematical_economics_free_download.pdf
    • https://uploads.strikinglycdn.com/files/bbd32317-68a8-4c75-8f79-68b35a9c1bc2/nuclear_power_station_flow_chart.pdf
    • https://uploads.strikinglycdn.com/files/ccfa56b7-0882-477b-832c-801c1400d4c6/tropic_of_cancer_and_capricorn_latitude.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e417.bin
bed0cf1f903423ea2b04742b6d1d5955b38bdbb862a13527c324f5f701f3714a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 5508 bytes