Malicious PDF — malware analysis report

Static analysis result for SHA-256 8077269886e2a3e0…

MALICIOUS

PDF

76.9 KB Created: 2021-03-21 02:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84d00f076e1afa247328b25802a23fa6 SHA-1: 40559ec3302819f9abeadf2d5c1953eab0362d39 SHA-256: 8077269886e2a3e0ca3d51d2f9f2295d35a10fbdaa4ccb12b7d63f4bb338f8d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/wix?keyword=comparative+study+of+two+e+business
    • https://cdn-cms.f-static.net/uploads/4427828/normal_603a154ed6f19.pdf
    • https://sonojija.weebly.com/uploads/1/3/4/7/134723635/60f4faca02d9.pdf
    • https://digojumowixev.weebly.com/uploads/1/3/5/9/135989627/93a1f43.pdf
    • https://cdn-cms.f-static.net/uploads/4485329/normal_602daa0e49bec.pdf
    • http://vuwimoxit.mygamesonline.org/article_defini_indefini_partitif.pdf
    • https://static.s123-cdn-static.com/uploads/4393348/normal_5ff0336a6904e.pdf
    • https://cdn-cms.f-static.net/uploads/4417222/normal_600c9db85dcba.pdf
    • https://zisusanizapan.weebly.com/uploads/1/3/0/7/130775047/pewaluvijodizovewuli.pdf
    • https://talaxosukizarom.weebly.com/uploads/1/3/0/7/130775084/2d5fc6e0a9a4.pdf
    • https://zugipevewepa.weebly.com/uploads/1/3/1/4/131483317/safazanudeg_pizokepu_gujonus.pdf
    • http://mareson.getenjoyment.net/xemufib.pdf
    • https://fiwobezamarevev.weebly.com/uploads/1/3/2/7/132740324/salewopukufolunew.pdf
    • http://vojemodipu.sportsontheweb.net/zegafiginenenuwowulafiwo.pdf
    • http://bulepozobagepud.mygamesonline.org/bulbar_and_pseudobulbar_palsy.pdf
    • http://gepopusoka.mypressonline.com/53879918206.pdf
    • https://xatawelakobij.weebly.com/uploads/1/3/4/6/134685719/44507bf3602.pdf
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/tuvojig.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pekafujojef.onlinewebshop.net/97758930028.pdf
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_58cce093d0b846f2a1d4c04dcd45cf67.pdf?index=true
    • http://namakanexir.atwebpages.com/is_vitamix_really_worth_it.pdf
    • http://beliraguw.onlinewebshop.net/pitozunerarisijivazif.pdf
    • http://xurosuforudev.atwebpages.com/business_ideas_with_low_investment_and_high_profit.pdf
    • http://dowafirowelumex.atwebpages.com/ielts_speaking_questions_with_answers_download.pdf
    • https://5b0e1d79-1acc-45ba-a965-31015372eee8.filesusr.com/ugd/67f5f7_a59d581984dc458a9649a538333ced16.pdf?index=true
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_e713018bc6e949ee9019055e42e34521.pdf?index=true
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_8b9b6ff8decc49b690f6a5887c4ed884.pdf?index=true
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_b20744b5cf8d47068eec113ffd326e07.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f008.bin
6f16fb120c0d25dc886595895189986e7266d3bff8120ce972e32678b8c1c1ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF008 5456 bytes
font_01_sfnt_off00010291.bin
29e06c41270a6aca76d9e0883238067b5c6064328e6f5981ed4755bbbcf2cbfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 10244 bytes

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