Malicious PDF — malware analysis report

Static analysis result for SHA-256 357e9e1f18c47ec9…

MALICIOUS

PDF

99.4 KB Created: 2020-12-08 11:45:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 7c0f7830c533dc415eb292f78e6a60bc SHA-1: 9230fe6544077aaa6e8e086d16e7119297c4f7aa SHA-256: 357e9e1f18c47ec9d65dd992bc2ec93fe534089004f7aae170b9c2654f3e12c8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/123?utm_term=gestalt+therapy+for+dummies PDF link annotation
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/gevekiberefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5f8a2f7b42f5f.pdfIn PDF document text
    • https://saloramorolo.weebly.com/uploads/1/3/4/3/134307331/pexisukimizixu-rogim.pdfIn PDF document text
    • https://nenarixu.weebly.com/uploads/1/3/4/8/134899789/xewavobute_joluk_gekabi.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/vasisasuzoxatemoruwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_5fb9513b07375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5fa02cd1445b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388160/normal_5fab2d184969e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b107689-9a0a-49a7-8ec4-89c9076ef6ab/newgy_robo-pong_2050_drills.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/nagaga.pdfIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/elodea_lab_worksheet.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_off0001484f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484F 5416 bytes
SHA-256: 75ffce87ae9ba7fd831df45356e86c7911bad98e408c11b2796f7dfde493c64e
font_01_sfnt_off00015a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A99 11216 bytes
SHA-256: 5e9c220bd5f3cc6794e7b9b905fd6c2d7a2e72b04e19619cc713c711679b39c5

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