Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56220fc3d8943cc…

MALICIOUS

PDF

136.0 KB Created: 2021-03-17 02:07:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ccac06304e76c6082c922d3e481e828d SHA-1: b671e7c4e9fa6312b76fdbc8a70b8cbb9b54a127 SHA-256: a56220fc3d8943cce43044595859473e6e5ae53edb458076d2b618d194710569
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'driving school' and 'apk game', aligning with a lure to download potentially malicious software or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/123?utm_term=driving+school+2018+apk+game PDF link annotation
    • http://nojekufa.22web.org/vidatezagitowofudoluw.pdfIn PDF document text
    • http://xtw2.club/javascript_definitive_guideazu2r.pdfIn PDF document text
    • http://jowakemanek.iblogger.org/arpaci_conduction_heat_transfer.pdfIn PDF document text
    • http://letaraluzim.scienceontheweb.net/zigelide.pdfIn PDF document text
    • http://iblack.space/tracey_gta_593fjz.pdfIn PDF document text
    • http://sawotawigusewon.22web.org/cardboard_design_files.pdfIn PDF document text
    • http://wajulosuju.22web.org/23774981530.pdfIn PDF document text
    • http://juzajikadig.22web.org/liluvejem.pdfIn PDF document text
    • http://xokebidukefu.getenjoyment.net/fetejukiwivejututedew.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/kurikurilotogemeq5kfu.pdfIn PDF document text
    • http://pexulisinipev.sportsontheweb.net/21664565585.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_eedf823eb8a54bbfa7c103390e36f03f.pdf?index=trueIn PDF document text
    • http://zanebinelit.rf.gd/pajamuguvubakobanipol.pdfIn PDF document text
    • http://bejerokifeko.rf.gd/what_is_universal_set_in_set_theory.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_22adb419b12e40138be890643279c3bd.pdf?index=trueIn PDF document text
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_1b86c7a0575a420c9588138ed298b9fa.pdf?index=trueIn PDF document text
    • http://xumuritikoxuk.myartsonline.com/vivuzebe.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_1e7e43c2280143138851984f84e7a5e4.pdf?index=trueIn PDF document text
    • http://jilutuve.rf.gd/android_studio_sharedpreferences_save_arraylist.pdfIn PDF document text
    • http://bepidinotovat.rf.gd/does_weight_gain_affect_shoe_size.pdfIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_226514067f5b41ba85fc9eb0f7b42fba.pdf?index=trueIn PDF document text
    • http://fofeparulofiz.rf.gd/busybox_pro_apk_pure.pdfIn PDF document text
    • http://xekokopadupino.rf.gd/misbehaving_thaler_review.pdfIn PDF document text
    • http://lulovijolezon.epizy.com/shaman_vanilla_wow_leveling_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B727 5988 bytes
SHA-256: 95f3c5312f2eb0a0cb9a146d01ed9405db1721e63923716013b54c6bc08cd69b
font_01_sfnt_off0001cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB7F 21392 bytes
SHA-256: 5541d436ed136f98b356c8d3b9eb8d13419902a24ee9553aa07addb6bc690920
font_02_sfnt_off0001fcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCEF 16060 bytes
SHA-256: d8a1a34de14a7b8fce5e51635835121d353d188f9ac9ce1e11538509fd4c5cdc

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