Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e4429fe6f023e98…

MALICIOUS

PDF

76.6 KB Created: 2021-02-15 08:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5a65ef779512f1eb8e70b91c776de724 SHA-1: 8e069ce33fff299d972d21b872860a0ed49f1692 SHA-256: 3e4429fe6f023e9875c56f57d6bf14c4590172af8771de8012db6cf80c2ea986
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URLs, 'https://seumenha.ru/aws?utm_term=answer+synonyms+list', is presented in the document body, suggesting a phishing or traffic-generation lure. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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/aws?utm_term=answer+synonyms+list PDF link annotation
    • https://vanazufir.weebly.com/uploads/1/3/2/7/132740694/1174483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465914/normal_5fda30e47f0f5.pdfIn PDF document text
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/lekudigupuv_nenobin.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/8422639.pdfIn PDF document text
    • https://fabegobidik.weebly.com/uploads/1/3/1/4/131437275/nakuvuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/libeganot/manualidades_botellas_de_plastico_reciclado.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/christian_songs_ringtones_mobile_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fosawef/media_creation_tool_windows_8._1_free.pdfIn PDF document text
    • http://kewivifonawati.epizy.com/54449807683.pdfIn PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/camera_app_for_android_9.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/37106658076.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/2139457242.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/studio_background_for_photoshop_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/kemaxarakobofomi.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/5175971312.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/zoxulugesesajufexomazema.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_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 4804 bytes
SHA-256: 8730ae9dc7bb641b515249b92959edb707bc83d100e7c6cc3fc0afc0d806166f
font_01_sfnt_off0000fc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC76 12716 bytes
SHA-256: 4bc418025bdd22af81603b370b6ee89374f7a94dc50ea75bbac5ce5502fcf6ea

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