Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d32b8ec77a0af3…

MALICIOUS

PDF

79.0 KB Created: 2021-03-31 21:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d0a93be04c651b8a3bb39d790e3835c SHA-1: 73dc9e4d762c283747645dfd240afb14674aa131 SHA-256: 37d32b8ec77a0af37a6d801704bb01ed6913a62c86f8379a93c14bb30eeaae96
124 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and exhibits characteristics of a link farm, containing numerous external URLs. The document body, though heavily obfuscated, contains text related to simplifying expressions, which is likely a lure. The presence of many external links suggests an attempt to redirect users to potentially malicious sites or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4988

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://jottigo.ru/strik?utm_term=how+to+simplify+the+expression+with+exponents
    • http://honey-love.ru/rhoda_kellogg_stages_of_artistic_developmentn1uxd.pdf
    • https://cdn.sqhk.co/zebenane/idCibjg/snow_bros_original_game_download_apk.pdf
    • https://cdn.sqhk.co/nexasolonit/ihiBwge/nabiboxemiraxawaja.pdf
    • https://cdn.sqhk.co/kidatufo/KKjihbn/jivudiselob.pdf
    • https://cdn.sqhk.co/pipujevi/djhbUx7/calendar_september_2020_with_holidays.pdf
    • https://cdn.sqhk.co/ralapogifur/GugjBhh/wageworks_commuter_benefits_parking.pdf
    • https://cdn.sqhk.co/fotajoge/jhhvii4/angry_crab_shack_goodyear_arizona.pdf
    • https://cdn.sqhk.co/nisuxibuzoru/8D6QAgd/68977172540.pdf
    • http://notdull-eng.online/narodezufek5fsjh.pdf
    • https://cdn.sqhk.co/kajutizikodu/jnhaFgf/fasivuzokegegiw.pdf
    • https://cdn.sqhk.co/kogewole/gcRXvjc/22521679168.pdf
    • https://cdn.sqhk.co/lilodipu/hhu3ihK/tikidafejuxibikawaxe.pdf
    • https://cdn.sqhk.co/wuvevalor/c7KXMtK/viminosabax.pdf
    • https://cdn.sqhk.co/zivugeri/oA73XIk/65455674192.pdf
    • https://cdn.sqhk.co/tetaxekumipi/CgiSVFu/40479815868.pdf
    • http://mosquito.codes/amreli_mallanna_video_songs_ingrd4yy.pdf
    • https://cdn.sqhk.co/nogorodizet/pLibhfi/nebirojedewurideruwo.pdf
    • https://cdn.sqhk.co/dokukavifig/RjgsJA2/21457042305.pdf
    • https://cdn.sqhk.co/jasamomedam/qgigfp0/kode_with_klossy_jobs.pdf
    • https://cdn.sqhk.co/sotixesikux/h8icjbk/misasiwuwofijopaf.pdf
    • https://cdn.sqhk.co/bobimugura/ngdhg5b/hero_tycoon_mod_apk_unlimited_money_download.pdf
    • https://cdn.sqhk.co/goganededem/Rjbjghg/kexagoxem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_dcd7269cd3eb4699a8c53ead4c88997b.pdf?index=true
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_946f3065adb94579814fc8da49f66511.pdf?index=true
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_4302623290bb4a829b19911d8ef244ce.pdf?index=true
    • https://18b09f4e-de4d-4c1b-9fe6-be55c63b1c00.filesusr.com/ugd/cd81e9_8e94110149ed4cc49b4d08c7285f7d8c.pdf?index=true
    • https://d397443b-80d0-4e74-967c-4ce830ee3754.filesusr.com/ugd/0a76f0_f8568f91510041ea8fd182450f093971.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010cf6.bin
542f56aad3377e1d78a9c0729e81194eed141ba4ad4cae176c330cc3e5acdd64
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 5156 bytes