Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5014e0de6a0b5cd…

MALICIOUS

PDF

84.5 KB Created: 2021-03-18 23:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c26ca3449dd8e947323bf071908bc119 SHA-1: 2efc970454cc5a988ff3473b4913eec91783cf80 SHA-256: f5014e0de6a0b5cd704c205d55b76a50e4a9ab156917da648fb1edc269bc7d43
154 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to SEO-optimized content farms. One prominent URL, 'https://crophysi.ru/award?keyword=formula+of+mean+median+mode+pdf', suggests a lure related to academic or professional topics. The ClamAV detection and ML classifier indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6896

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://crophysi.ru/award?keyword=formula+of+mean+median+mode+pdf
    • http://rivozuzeno.mywebcommunity.org/zakuwiwutor.pdf
    • http://fijubigatusurov.scienceontheweb.net/kannada_love_story_movies_list_2019.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jutivowewinuled.epizy.com/how_to_alphabetize_worksheets_in_excel_2016.pdf
    • https://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_7094728458074773ad6d9e30c98ffcff.pdf?index=true
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_f1c3d20183fc4871abd04b53e47040ff.pdf?index=true
    • https://e61e9f85-32c5-4861-9fd4-b89109084c35.filesusr.com/ugd/2e4eb4_119be1e60eee4c88a041c25e81414658.pdf?index=true
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_ec69786ecf674035a057396ec9674330.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_c0cf779c493f4d10a03cbe8269770568.pdf?index=true
    • http://gorobibo.epizy.com/43662118568.pdf
    • https://uploads.strikinglycdn.com/files/5bc379e8-dbaa-4146-b599-5682717a939e/91661242291.pdf
    • http://xavisijividefo.epizy.com/zonomog.pdf
    • https://s3.amazonaws.com/setikizo/how_to_clean_wii_remote_straps.pdf
    • https://uploads.strikinglycdn.com/files/ec151464-4642-4077-b386-59de44ded44f/55561681173.pdf
    • https://s3.amazonaws.com/wizuluworafid/ascanio_cavallo.pdf
    • https://704d67de-a0ba-412a-a77d-f8c4cf0d88a3.filesusr.com/ugd/a83d94_e4f089155d3347b8822eb3c947d9089e.pdf?index=true
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_da9fbc1559ce4844b393b4a0b367015f.pdf?index=true
    • http://japinoxizidunub.myartsonline.com/what_does_personal_mastery_mean.pdf
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_e782d97534154280bd7d78de87d0ab13.pdf?index=true
    • https://s3.amazonaws.com/tirimofufemukat/asrock_h310m-_hdv_driver.pdf
    • https://uploads.strikinglycdn.com/files/6e01f35e-0382-40e5-a566-c3d40cc87fdb/51449855502.pdf
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_371390aa8f7a4f2b8aae628502669a00.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bcd.bin
9cbe818002d7aaab68b6f877d72d20c5651daa977c9cc0622092c7aaacf6395d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 4964 bytes
font_01_sfnt_off00011c9c.bin
a92ea4540ce76d93bce9e59255a8657b2323cc549d120a8e0aa05ac575385298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 11692 bytes

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