Malicious PDF — malware analysis report

Static analysis result for SHA-256 be60d9bce06b6ea5…

MALICIOUS

PDF

66.8 KB Created: 2020-11-17 05:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 69a18a56c4c80ff3f080d6725d489c15 SHA-1: 2b773429bf56ce687a509ee5f67af4b9a9210b21 SHA-256: be60d9bce06b6ea5bf682a7fca7b88bbf7a05a21055b97dd4e30f6c77620d5ef
186 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 0.9998

Heuristics 6

  • 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.
  • 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://trafffe.ru/123?utm_term=four+foods+group+franchise PDF link annotation
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/1289421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404976/normal_5f990b9d7149a.pdfIn PDF document text
    • https://bizalaso.weebly.com/uploads/1/3/4/4/134443832/6bd6e02c7da83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fa51a34ef069.pdfIn PDF document text
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/376ce1651f.pdfIn PDF document text
    • https://kutenamig.weebly.com/uploads/1/3/0/7/130740069/mipusitopipo.pdfIn PDF document text
    • https://nebegozanukasaz.weebly.com/uploads/1/3/4/6/134699913/2539938.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/1c51848932.pdfIn PDF document text
    • https://besiwalufeg.weebly.com/uploads/1/3/2/6/132696214/ab567c41b4.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/cb46863a-71a6-4ded-a64b-f9fabba1fd9e/79642630893.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57259f04-1bbb-4c13-a637-80afa326c1c8/nodenerigeximago.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/pickaway_county_common_pleas_court_view.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31abb9b1-ce8f-4882-9cac-56954ec17f64/how_to_build_military_grade_suppressors.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_off0000c7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BE 5340 bytes
SHA-256: 59ea0ef7e0f44821a5e4809a75f97a97a641bdfc8bbb894846189f7bfb827fd3
font_01_sfnt_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 10820 bytes
SHA-256: c6276a446e53659ff2ec591320f2acb934e7da33122c6507b3bf8e5e8588e560

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