Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c43b7292fec41c…

MALICIOUS

PDF

63.3 KB Created: 2020-12-22 06:57:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 226fd2d0af7512697c3acd29bd8cb411 SHA-1: c3f30c64a9e98df4d915081ec4ed7a80c4deeea4 SHA-256: 13c43b7292fec41c9e5240fe689e087cada75eb297d71ce8572ba0395d5154e5
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The heuristic firings indicate the PDF is designed to link to external content, with a significant number of links found. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=libro+tu+hijo+tu+espejo In PDF document text
    • https://dujenavu.weebly.com/uploads/1/3/4/3/134366251/nafejivusop.pdfIn PDF document text
    • https://sekuruzinof.weebly.com/uploads/1/3/4/8/134897543/nidapenajebaxemerosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_5faa1955e96b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367952/normal_5f8b4d1d018ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5fddb6d5e68ea.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/2c4317a0-70c8-4db1-9533-3e66fe277c28/18229917359.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/british_council_library_membership_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7c99446-b1e4-4a39-a749-8257ec6cb399/female_sloth_in_zootopia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bea2b5d-d7c8-456b-a706-303fecb0fdf1/zidabese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c035d885-3cb0-4d4f-b0dd-2b452d751c76/15099727121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303a7348-e799-49eb-962c-5a289da03635/north_ridge_elementary_lubbock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f4faace-b2c2-4d0e-b477-f6b44110d2e7/donubutaroguf.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/best_navigation_app_android_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f96d81fa-2ba1-494c-a0d3-8cd634cde849/ps1_bios_scph1001.bin_download.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB88 4824 bytes
SHA-256: d953e183f9dc117ea681d19aca4401fa119ac073257cb8a1310afd5617030331
font_01_sfnt_off0000cbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEB 10780 bytes
SHA-256: b26722b06553866fd05e12216a27ae7e5396ff385d747086ff38f37219a92871

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