Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d22f666b44beb6…

MALICIOUS

PDF

65.9 KB Created: 2020-11-20 23:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 633a5c7b31c6fbb4749d7046758a7152 SHA-1: d752819db70feecccab7f2794dbdb7e0a4db5d30 SHA-256: b4d22f666b44beb676eaa33e8f879e66ce73cdf5865f2256a80d2f36b2175c01
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 0.9998

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://traffnew.ru/aws?utm_term=dibujo+tecnico+arquitectonico+pdf PDF link annotation
    • https://latewumopinigan.weebly.com/uploads/1/3/4/3/134313498/d1f1d7cef64a.pdfIn PDF document text
    • https://zomafada.weebly.com/uploads/1/3/4/7/134772300/gabopanurexol.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/cb9686b.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/5410637.pdfIn PDF document text
    • https://kuxifegofemiza.weebly.com/uploads/1/3/4/8/134865321/5360738.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/4da518bc-47e3-4297-b894-dde4af97d134/gizezolafid.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/69173118072.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/the_disappearing_spoon_online.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/pinch_hitter_2_game.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/richard_burton_arabian_nights.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/30756150930.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99c15ef-b97b-4d4d-a835-55d994e62401/imagenes_de_materiales_naturales.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/eccentric_exercises_for_tennis_elbow.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_off0000c54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC54F 5280 bytes
SHA-256: 5349eb68f67cb15d2264457262b892ebf9513408cf189f76e2169dbe0bf3f3f9
font_01_sfnt_off0000d755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD755 10604 bytes
SHA-256: 951ef66e5f6b0a546255b5caa265712fc140bc237e69381a91201bf9275e2bbf

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