Malicious PDF — malware analysis report

Static analysis result for SHA-256 8add4fd5a86cfe63…

MALICIOUS

PDF

68.1 KB Created: 2021-04-02 14:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16ac488254526d4be446b1fa5ef3a71 SHA-1: b1062e463ffec0df58aa9ab1a2fd746b2f3af427 SHA-256: 8add4fd5a86cfe63920b441efa118e27f866ab6249c096797b0bf34cabcb55a4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to Weebly and other file-hosting services, suggesting a link farm or distribution point for malicious content. The ClamAV detection and ML classifier indicate a high probability of malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and numerous external links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8464

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://botokaw.ru/award?keyword=all+electrical+circuit+symbols+pdf
    • https://nugasoxitobaj.weebly.com/uploads/1/3/2/7/132710773/5514a1b63.pdf
    • https://zevuvizaxetu.weebly.com/uploads/1/3/4/8/134887967/7944289.pdf
    • https://cdn-cms.f-static.net/uploads/4401555/normal_603a467a5b5ca.pdf
    • https://sajolunuweto.weebly.com/uploads/1/3/1/4/131407571/gapoto_bikujamana.pdf
    • https://cdn-cms.f-static.net/uploads/4413975/normal_6021e9b7d9bda.pdf
    • https://ramageputa.weebly.com/uploads/1/3/1/6/131637054/1199233.pdf
    • https://cdn-cms.f-static.net/uploads/4454432/normal_602c684ccda90.pdf
    • https://titugujogimob.weebly.com/uploads/1/3/4/0/134017720/8472929.pdf
    • https://cdn-cms.f-static.net/uploads/4486983/normal_6057a631466f9.pdf
    • https://vutitikanok.weebly.com/uploads/1/3/4/7/134774074/f7f00ecbdbcccd.pdf
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/2148293.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tanofekomom.epizy.com/85374658804.pdf
    • https://s3.amazonaws.com/jedobufudajewu/brain_teaser_games_android.pdf
    • http://tibibexubedumu.rf.gd/17079512074.pdf
    • https://c31d65df-273c-4bcc-acfb-7b03b0724b99.filesusr.com/ugd/e7e4a0_815c00513d6f448592902bcc17e6dd15.pdf?index=true
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_6f1a7b317d7e436dbebc018b45bb9346.pdf?index=true
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_14e8369677b04075936bcf1b8b3ece6b.pdf?index=true
    • https://f79c4d19-9b07-4ca9-ba82-4f938217db57.filesusr.com/ugd/c0d3e8_fc75b68b39ff427dbdb9cf205e2e967f.pdf?index=true
    • https://s3.amazonaws.com/luropiw/best_forklift_training_program.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e81c.bin
0d91d3661e4e0475b4a92fd20a62ea24e4ca93d78559e95c280ea7a36fc487f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE81C 5308 bytes

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