Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2909ee83ca783c…

MALICIOUS

PDF

81.1 KB Created: 2021-02-25 12:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 081ba9e6af87e6fb225da5c154885bcb SHA-1: 905a1bd6e679ecceac2ec08c39047360622bb657 SHA-256: 4e2909ee83ca783c974222408cdad63f091acc80941b31b22d2e0dee4e093c45
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'maypoin.ru'. The document body, though heavily obfuscated, suggests a lure related to a 'worksheet', aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=la+navidad+en+mexico+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454971/normal_600f55d8cb06c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529697/normal_5ff2bb583b4ea.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/gozikum.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/7761462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383446/normal_5fe89dee5759e.pdfIn PDF document text
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/dumefosujorudo.pdfIn PDF document text
    • https://nosakaji.weebly.com/uploads/1/3/5/9/135958263/widiz_pisakukivowimow.pdfIn PDF document text
    • http://icily.xyz/ap_psychology_psychological_disorders_webquest_answer_keyul6av.pdfIn PDF document text
    • http://qunit.space/53370727303zcrcg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_600ff79e926bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5ff3574bea88c.pdfIn PDF document text
    • https://zazokovorif.weebly.com/uploads/1/3/4/3/134321981/9db9a75f5.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/purunajefutoxumono.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapoloferazuziw.atwebpages.com/14638421074.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/is_vitamix_really_worth_it.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/brand_identity_manual_free_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/ketadeb.pdfIn PDF document text
    • https://s3.amazonaws.com/nilafafakem/67509045540.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/nipetetomi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C7 5372 bytes
SHA-256: cc44baa190dd0c34d0b0724f3e56066ea6f29a46d8a9711a38f19e39dc38794a
font_01_sfnt_off000102fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FE 17100 bytes
SHA-256: 8fb4f90a35aafe1b1e326c0dd573257d2f1c8c7c87e159ecffa59f9a71189382

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