Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a0049563ef5ac3…

MALICIOUS

PDF

68.8 KB Created: 2020-12-14 02:02:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: a3e6a1ef31fc5b4503c046ab55ed9994 SHA-1: 5b3daebcd14d59462983b71536a99a002e27b5a9 SHA-256: b0a0049563ef5ac36fce050f2d252252a4587ea1fde957a2c3494c96057d563d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external PDF links, with one pointing to 'https://s3.amazonaws.com/gidibesuxi/52307117539.pdf'. The presence of embedded URLs and the ML classifier flagging the PDF as malicious further support its suspicious nature. The document body, though heavily obfuscated, contains text related to shipping times, likely a lure.

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://traffking.ru/123?utm_term=cuanto+tarda+en+llegar+una+carta PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5fbf307d9586e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465719/normal_5faf78e4caffc.pdfIn PDF document text
    • https://menudobuwowewil.weebly.com/uploads/1/3/4/7/134765252/4fb67b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385413/normal_5fd632c11f879.pdfIn PDF document text
    • https://sedivunoruset.weebly.com/uploads/1/3/4/8/134859312/xinubiwefoguze_degasinagawo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5f9a511f3e35d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458412/normal_5fb4f7fa1f5bf.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/gidibesuxi/52307117539.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28723b4a-81a0-4399-baa5-452e8fe9a9eb/mama_s_guide_recipes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc589e9084698658e7dc178/t/5fc80d9c3d9ef76cdd353c76/1606946204449/my_cloud_home_or_my_cloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040722fa-5b95-4a52-9163-2a024d0b99a9/34125198708.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55f236b97992eb5798b5c/t/5fcfe9645fa26f4a9ee4ed02/1607461221000/light_up_shoes_for_girl_toddler.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b55551c-1a30-4cd4-9a05-0911c48ef906/58751462304.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18aa71f0-4df6-4fe9-a668-8bfa4fccdd70/relasetelekovesovogowogo.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/kirby_right_back_at_ya_tiff_x_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/091f63ac-d9d5-4706-9218-93544a5ca6d8/simple_temperament_test.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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 4832 bytes
SHA-256: f67e89bad2363eebc6cc52d57bf3d9f11e3fba6b138c345cbd5b806afb4d8be0
font_01_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 11356 bytes
SHA-256: 083a59d904b1ccfd1c702a2bf7e6387768ba0dddc78f200262c42e7cb59a8c16

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