Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d2bdde81580081…

MALICIOUS

PDF

80.8 KB Created: 2021-03-24 05:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b16de42cb4a351ce4ec0bcb53f61e128 SHA-1: 7ac30943c3c6e7f0f72859effaea2e2d1c10db27 SHA-256: 57d2bdde81580081c0440b7903db4223784d493c5457b8b6b167bbf33f3022ba
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains or domains with unknown reputations, suggesting a phishing or spamming campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable hosting. No scripts were extracted, but the overall structure and URL distribution point to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=what+is+the+synonym+of+unity PDF link annotation
    • http://auto-agents.space/titusujoku5w6qo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530036/normal_60392130afec4.pdfIn PDF document text
    • http://copyrighthelpcentral.com/acoustic_guitar_lessons_for_beginners_youtube31g6m.pdfIn PDF document text
    • http://nextauto02.ru/bekhayali_mein_song_mr_jatt1t4ak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ffe4caaab60c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418968/normal_6016ed21714cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5fe2df4c15466.pdfIn PDF document text
    • http://opt05.ru/briggs_and_stratton_yard_machine_550ex_manualwrzc7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446642/normal_6044219f70f32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409421/normal_603b4ea5d32a9.pdfIn PDF document text
    • http://just-gopro.com/kojekubimepita4i4do.pdfIn PDF document text
    • http://xivixevikid.iblogger.org/blood_relations_in_telugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375896/normal_60400bcacd389.pdfIn PDF document text
    • http://keepmaxi.space/what_is_hard_as_nails_used_form61d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_604193715f63e.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/anomaly_2_1._2_apkitq8t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_d649d711e672438cbed8965a76f89ed2.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_f1a8ca61a07d4e89bad58870bd1c7bb0.pdf?index=trueIn PDF document text
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_98e296063ac5430c92c0bcb75b7b515d.pdf?index=trueIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_3d883186f80447e7a577161098222c0d.pdf?index=trueIn PDF document text
    • http://mibexaluji.epizy.com/xadobekalajenukikamepape.pdfIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_1bd177d63f5d400284cf87cd5e9cae7a.pdf?index=trueIn PDF document text
    • http://zabotafe.epizy.com/agro_ecological_zones.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF160 4876 bytes
SHA-256: e3f05a0b6a7750b92ffb14a1a37bd47c5dbe3dec79e8d59a370f7b76b7f6ec0f
font_01_sfnt_off000101db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DB 11360 bytes
SHA-256: 628304da13f05f22933a777f402f747e114de0e2951c5cb5a5bbadebd829946d
font_02_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2