Malicious PDF — malware analysis report

Static analysis result for SHA-256 25b5f39b7e86c217…

MALICIOUS

PDF

78.6 KB Created: 2020-12-21 11:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 2499cc22dd4b60430cd0d7465626a79a SHA-1: 982197eff4c7130756ebfe2377de99aa9c86cfa7 SHA-256: 25b5f39b7e86c2177801067bcd87bd6b9fbfe5ef1a88eac856a416ecca039076
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?utm_term=grandparents+day+ideas+for+school PDF link annotation
    • https://xavozunop.weebly.com/uploads/1/3/4/3/134305705/rukegonivi_xajara.pdfIn PDF document text
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/sekanomafip.pdfIn PDF document text
    • https://xekigugoraka.weebly.com/uploads/1/3/4/4/134434326/125afbcd15b35.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/dugibabafod/winegelozexap.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdfd930ff074777c9861b5f/t/5fdfe24715a11837d0c8e468/1608507976026/luzomurukuromolawanod.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/blank_warranty_deed_form_missouri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa35ba3-90c2-4c16-a1e1-2396ac6b21d7/22670192002.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56e1ff9-d9cf-479f-b72d-437e1cf3c06c/young_jedi_knights_series.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/62899342377.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2a4ad7fbea164c2cd181/t/5fdd5404e64f57031510f7c4/1608340485072/fidika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2e91022-46f7-4182-ae51-794f26e4804a/damon_heart_porn.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6bdee8c9e503d27a507e8/t/5fc782beb2fa4660c8d69c71/1606910654609/best_fall_craft_beers_2019.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc54b64c6d96458363f1fd1/t/5fcce25f83d2ac65cc135d26/1607262819058/menusedatos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48568590-701e-4da8-a471-c685ba3b8eef/was_ist_Los_mit_billy_eichner_Auge.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/mogigujepefaf.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010817.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10817 20664 bytes
SHA-256: bd4b1ec1742243583b33dd28925c73de2751635cdb40af9a3dfd2887589c7c16
font_00_sfnt_off0000cd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9D 5376 bytes
SHA-256: 474143ca7229bf9d1dbfde75004980c19873da907d2f08773aa93b234696897c
font_01_sfnt_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 12208 bytes
SHA-256: df00eb76562d461658471f85bb063f51896e94ff059c51092e13c7a704600883

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