Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e027516f3e1fa20…

MALICIOUS

PDF

76.9 KB Created: 2021-03-19 03:20:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ec03667b269a8cdadbd9df061c3a80 SHA-1: 6e645f4fd7b570add841a6acb7e7c5f9fde53b0f SHA-256: 6e027516f3e1fa2071ad3fe497fb997e19c17f79c084f3042c4914b26e67c3bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF documents, indicating a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure itself is used to host and link to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/aws?utm_term=2500+calorie+meal+plan+for+weight+loss+pdf
    • https://cdn-cms.f-static.net/uploads/4473926/normal_6014b925e274a.pdf
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fddcd0b21877.pdf
    • https://cdn-cms.f-static.net/uploads/4402938/normal_600d5161848eb.pdf
    • https://cdn-cms.f-static.net/uploads/4455658/normal_5fea22f41ea79.pdf
    • https://cdn-cms.f-static.net/uploads/4420905/normal_604673b231eb9.pdf
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/pixugozijonuresat.pdf
    • https://cdn-cms.f-static.net/uploads/4408177/normal_5fd124a48b5b8.pdf
    • https://cdn-cms.f-static.net/uploads/4411931/normal_6046c8bcbe6ad.pdf
    • https://cdn-cms.f-static.net/uploads/4412159/normal_5fd99f4da7c9d.pdf
    • https://zegasapazenavu.weebly.com/uploads/1/3/5/3/135326880/9269141.pdf
    • https://static.s123-cdn-static.com/uploads/4375705/normal_5fec1b75e9f45.pdf
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5feb4e156e8cf.pdf
    • https://static.s123-cdn-static.com/uploads/4413575/normal_6007d6d59236d.pdf
    • https://cdn-cms.f-static.net/uploads/4445555/normal_602c747a17302.pdf
    • https://fawukudaboguris.weebly.com/uploads/1/3/4/3/134353338/f79ee133026.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_33245ef89a7240fea127225d44ae2085.pdf?index=true
    • https://s3.amazonaws.com/firudegix/bubble_bash_game_app.pdf
    • https://s3.amazonaws.com/gotitibekovi/saa_green_book_step_2.pdf
    • https://557345b1-98c6-442d-b460-9e357c178e5b.filesusr.com/ugd/dfb5f8_1a82d1c1b19d4a4da6baa7a1e076a497.pdf?index=true
    • https://s3.amazonaws.com/boxujetanonikuv/apricot_brandy_nutritional_information.pdf
    • https://s3.amazonaws.com/kefefetafij/95654444502.pdf
    • 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_off0000ecbf.bin
ae64aa323abdf94ca57455329817634358fd038da91af80010e7f706e6fb173b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 5964 bytes
font_01_sfnt_off000100f1.bin
7f3dcecffe12f460eb26d7752535c0f797fbca55aa7c229a3eb5a0bcf2a1873c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 10792 bytes

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