Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd18c9d0f951285c…

MALICIOUS

PDF

89.1 KB Created: 2021-03-09 00:52:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e4fcafa200101424c0adfd1ca99abe30 SHA-1: 672e94bb2f011bfce0191521a6b2cf0a179b5363 SHA-256: fd18c9d0f951285cea0cef4409c5c87bc94395594a68e827fcbb72f3e98e2644
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://seumenha.ru/award?keyword=great+man+theory+criticism+pdf', are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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.
  • 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://seumenha.ru/award?keyword=great+man+theory+criticism+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454665/normal_6025c24181cc3.pdfIn PDF document text
    • http://triple-doska6.club/nomufufoyrs69.pdfIn PDF document text
    • https://pilewamef.weebly.com/uploads/1/3/4/8/134849526/zepisawajurawob_wotifozotu_kikowewoxo_dosazasavitexal.pdfIn PDF document text
    • http://counterman.ru/80355136169yogrg.pdfIn PDF document text
    • http://fullhp.info/diluxamcopvv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491437/normal_5fee405a32150.pdfIn PDF document text
    • http://erogan24.website/92214892495vsyp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5fc96be5a20b6.pdfIn PDF document text
    • https://rexawalifutox.weebly.com/uploads/1/3/4/4/134458468/duvutuj_samedodidik.pdfIn PDF document text
    • https://zuxadozi.weebly.com/uploads/1/3/4/6/134662888/sogidowapo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390350/normal_5fffcb0669dd9.pdfIn PDF document text
    • http://bbflowers.net/jowimuxalekevekobekew8f0yg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_a27256eb323e4eae98ee6ce8d5a47e12.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_b754905a8fa248928d52f263bd106072.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/cafeteria_plan_advisors_form.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/41038192458.pdfIn PDF document text
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_e4464a055a994786b8eacd8012d6cfbd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesotat/redugijijotunawumovufa.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/dujezixafalusekile.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/39102963734.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/meshare_app_for_android.pdfIn PDF document text
    • https://b7eb3c74-9f10-4efd-a612-efb7ea03662f.filesusr.com/ugd/7198c1_638ab14d0b4f46ecab8759e8a6659751.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/as-_1774sr_installation_guide.pdfIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_48d0bc3420ac474cad1d1ac963a2aa4b.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_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 5496 bytes
SHA-256: 1838cb0a21787ac97cf2f0ba9d48ddf672b6fc73ba8a055db37b7b143e8f2ceb
font_01_sfnt_off00013412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13412 10196 bytes
SHA-256: 46835ec9627e09f0dade61d76a6a0a31dc24f416ae43da8a1c9675f7c520a4b5

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