Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5e975d9dcd3da6…

MALICIOUS

PDF

74.3 KB Created: 2021-03-07 14:46:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a65a3d343fe88d4e4362f4535ef8634 SHA-1: 702c6f22cc8eaeba3ad156a22b9b0900250e12f6 SHA-256: 1a5e975d9dcd3da60f1b137e8fed6a80b2f2529162409fe1e1423d525cf2f508
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and utilizing UTM parameters, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=1st+grade+math+coloring+worksheets+halloween PDF link annotation
    • https://cdn.sqhk.co/rigidaluta/dggPlic/14067010112.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500692/normal_5fe3db11cba8e.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/dmgfLjb/juniremujaxamumozorunikor.pdfIn PDF document text
    • https://wuwikofoxanep.weebly.com/uploads/1/3/1/4/131437976/1010981.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/wChhDZX/dolabuxido.pdfIn PDF document text
    • http://pusatokolerax.mywebcommunity.org/2005_dodge_ram_1500_slt_4.7_specs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469101/normal_601a677e7b73f.pdfIn PDF document text
    • https://cdn.sqhk.co/mewowoji/VykqxYX/poutine_brothers_twitter.pdfIn PDF document text
    • https://gusefokujugox.weebly.com/uploads/1/3/4/0/134040973/poreganukonigu-vonatojivodan-vugalaxukigigib.pdfIn PDF document text
    • https://lumejukotexute.weebly.com/uploads/1/3/1/1/131163930/pumixudubenamukepa.pdfIn PDF document text
    • https://cdn.sqhk.co/wubejiwixu/g91wjWh/boss_katana_artist_manual.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/engineering_mechanics_statics_and_dynamics_2nd_edition_besavilla.pdfIn PDF document text
    • https://fuxexitir.weebly.com/uploads/1/3/4/0/134098624/watakejiwe.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/maytag_bravos_quiet_series_300_washer_ld_code.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/5jbjaER/hashtag_basketball_rookie_projections.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_46dfd0b1ba8340989ef0325e52795656.pdf?index=trueIn PDF document text
    • https://571cbd0a-ba82-408d-be6d-2df53a8fcfe5.filesusr.com/ugd/02af14_0c294e372984424db16b2785ab87efb6.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_01aeb5813b0a4d2cb3c88fba3ec6a95e.pdf?index=trueIn PDF document text
    • https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_cccb1a6aab484104a40d2ad41f18b727.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_cfc8002f3d924e55a3b64d70eb356679.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 5464 bytes
SHA-256: 3704f1a7aedb7af53a1420433591f5e4435a91f84aad1e4e18b73ebd5e1abab5
font_01_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 10600 bytes
SHA-256: 2476cbd64d4e4cfdeaa2f26d909a5f6080013c49a873f7f26b9dc3750aa4cf93

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