Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcff8e5e338aa610…

MALICIOUS

PDF

65.9 KB Created: 2021-03-29 10:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 785ebae7c3754a20f0eac3d6506a7dce SHA-1: e58825a385118503f0cba1a759468d05256c2d80 SHA-256: fcff8e5e338aa61084e4735f53d3bed76d7b98ad58adf9124cdb05a27e3108e3
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, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a primary one pointing to 'seumenha.ru', suggesting it's designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains text related to medical search terms, likely a lure to disguise the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=cancer+de+estomago+pdf+elsevier PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413007/normal_60091ca24d5b3.pdfIn PDF document text
    • https://kibewuzogoluwiw.weebly.com/uploads/1/3/1/6/131636689/wezekazebidikovoka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468259/normal_5fd0bc8f57b34.pdfIn PDF document text
    • https://gonotelavekufuf.weebly.com/uploads/1/3/4/6/134615299/7b89eb76bd.pdfIn PDF document text
    • https://wisomekusarukit.weebly.com/uploads/1/3/5/3/135384288/jadulenifuka_jinowivekomek_jufep_timatejemeri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393785/normal_60381e160d0c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_60411148132e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403814/normal_605a404c10914.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367625/normal_60023b4b766f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470524/normal_603517c672305.pdfIn PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/70853d5517e62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_6016c128e95c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_604dc09ce31a5.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/jalijaluxigipewemojiter.pdfIn PDF document text
    • https://nikamajavefuxo.weebly.com/uploads/1/3/1/0/131069808/letivenuxikari_dovon_judeguzoweted.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezevenakos.myartsonline.com/54923428713.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/37936886867.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/church_sponsorship_letter_format.pdfIn PDF document text
    • http://luvetux.myartsonline.com/aditya_hridaya_stotra_path.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/edible_forest_gardens_dave_jacke.pdfIn PDF document text
    • https://11484d69-1612-41b9-9199-165df1f08223.filesusr.com/ugd/e2f197_d3c9401821f84ddcbc29dc7400e40bdb.pdf?index=trueIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_c68f0668cc564aa6b64b68de70c22ba4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/37083861521.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_off0000c65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65D 5440 bytes
SHA-256: 24da6bf71c604a4855fbeb7add34b016104bf7a552587761f79e6dba9b662ab3
font_01_sfnt_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 9664 bytes
SHA-256: a6f8e6f92a565835350843b87389f215e69cd987bef4c10e9ec0126b6f82a5d4

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