Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5e3261469956f6…

MALICIOUS

PDF

59.9 KB Created: 2021-03-28 19:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e5f18cf928972560f1b3632be85c928 SHA-1: 9c0da53216966b01bb31caff13dd1611cf9cb720 SHA-256: 5f5e3261469956f6f47b706e7381ad9c485b70c4181c6c6b06c4037189dc5942
154 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm. One prominent URL, 'https://soxebez.ru/award?keyword=hospital+and+clinical+pharmacy+by+pratibha+nand+pdf', and another from the link farm, 'http://zexawil.22web.org/fepabu.pdf', are likely used to redirect users to malicious sites. ClamAV detection and ML classification further support its malicious nature, indicating a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7633

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://soxebez.ru/award?keyword=hospital+and+clinical+pharmacy+by+pratibha+nand+pdf
    • http://zexawil.22web.org/fepabu.pdf
    • https://cdn-cms.f-static.net/uploads/4413239/normal_604994b7dd9d7.pdf
    • http://tinuliv.22web.org/classroom_application.pdf
    • https://static.s123-cdn-static.com/uploads/4384472/normal_60035ed07f7d1.pdf
    • https://cdn-cms.f-static.net/uploads/4374838/normal_603cb59d3952f.pdf
    • https://cdn-cms.f-static.net/uploads/4421199/normal_6048a0cb7d4d1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_972b88ff55524e66bd8c86c2349c93e7.pdf?index=true
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_9c61b87f92e54ca68980f3235261c0b1.pdf?index=true
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_f0cdc7e58c524c9788dc6a5ab9827115.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3385dadf-be3c-4e07-919f-69b8840ca90c/xaporu.pdf
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_56b558193e5e42b9a91e4b4ddec94f02.pdf?index=true
    • http://nakosaf.rf.gd/mikejipezogu.pdf
    • http://wivovazu.epizy.com/31400120496.pdf
    • http://pikotesewelum.epizy.com/pegawenitutisek.pdf
    • https://f72e0e13-a873-49c5-9cb5-3c2848b8c5b2.filesusr.com/ugd/f8ba4b_09f25633b58247aa835df889affc58f2.pdf?index=true
    • http://tikikenuf.epizy.com/13937595751.pdf
    • http://nakitelas.epizy.com/first_alert_wireless_smoke_and_carbon_monoxide_alarm_manual.pdf
    • https://uploads.strikinglycdn.com/files/e7dd99f4-abf9-41da-aaef-782cb7117eeb/lorex_eco_stratus_app_not_in_play_store.pdf
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_51405ea4d2344a4597a2fb3982d43bd6.pdf?index=true
    • https://edb7bb8d-792a-4213-93ec-7f573d37cc74.filesusr.com/ugd/bfd504_da2aa577006a4e1aba90070c89dd1895.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7e63602b-0c89-413b-af83-ff7af1790eff/84400068597.pdf
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_c964e0d2859e41ee8fbd3abc9af3684a.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37e.bin
2b82d53492b73291936807356c11d3fcf9f4fd8b5633793bd33e358484a1445d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 5600 bytes