Malicious PDF — malware analysis report

Static analysis result for SHA-256 903c281ff27eeec3…

MALICIOUS

PDF

94.6 KB Created: 2021-03-05 03:52:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3eb87958a7fc21d27dc4db3236033922 SHA-1: e8d367e8911976b4b9167598153a7a5dad4fb219 SHA-256: 903c281ff27eeec3d7c69b7973fc9e610d123b0e1e1348fd9dc2f71a5b03480e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://jumiwimov.ru/wix?keyword=unidad+4+leccion+2+answers+spanish+1', is presented as a lure to a site that likely hosts malicious content or further redirects. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 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.
  • 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://jumiwimov.ru/wix?keyword=unidad+4+leccion+2+answers+spanish+1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452389/normal_5fe1fe4306161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412154/normal_603227ae39b9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491725/normal_60339fa06670d.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/kenneth_cole_watch_repair_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494429/normal_6019b93f50d8d.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://s3.amazonaws.com/rebomedug/nozumeka.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_769dfd76dfab438f8505d0a5b4a5ae6d.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_e94d5ad5e83f43c887c0d5950e5efcc2.pdf?index=trueIn PDF document text
    • https://a3c35cc3-4a3f-4d41-ab51-8b3e4b114d30.filesusr.com/ugd/2b25b5_d2df8239fb9b4284a78d33e66b77f127.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/post_cardiac_arrest_syndrome_guidelines.pdfIn PDF document text
    • https://1e16da7b-5b4f-4122-a3c4-5c88c9d97cf7.filesusr.com/ugd/83f04e_d32fa956cad14fa18b7429051f5f29d3.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_0f539840f7954551873beb0be1587429.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_2799a4eb49e24bd28b239fe991a6d6e4.pdf?index=trueIn PDF document text
    • https://fea67d75-dd3b-4bdd-af05-748e92ec8a52.filesusr.com/ugd/05900a_5ab1bd9d3c1d4630ac1d74c2d3ddc16b.pdf?index=trueIn PDF document text
    • http://lanosebezazov.onlinewebshop.net/69225947297.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/chocolatier_2_free.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/how_does_ms_monopoly_work.pdfIn PDF document text
    • https://3e1d1bad-f645-4ebd-ac75-469e7ff7c972.filesusr.com/ugd/e745be_2cebf8cde32a4afb908d87bbf3336293.pdf?index=trueIn PDF document text
    • http://widifusi.myartsonline.com/dosolupomidigani.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_b1bb6218879d4da094429358f6abe574.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_b85a49353d4a4d339b6e6afe429f0a9d.pdf?index=trueIn PDF document text
    • http://xovolefewawex.atwebpages.com/32214076703.pdfIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_9d1e662a73fd4dfaa9cd71bb4d6998c0.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 5224 bytes
SHA-256: dcda6eda2abc4130c691c368ad9d43c10fa45af67663a5adbc06d961b32e6afb
font_01_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 11084 bytes
SHA-256: 7585cd4d970872263b2c3fec3f8c8446755469f0671c00e8f1653aaaaa3e9b24
font_02_sfnt_off00014945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14945 16092 bytes
SHA-256: ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073
font_03_sfnt_off00015e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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