Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca6fd5508fbb025…

MALICIOUS

PDF

98.2 KB Created: 2020-12-20 20:17:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2db21bb893c68e1453bb6d04419d9029 SHA-1: 219e20cf15e0636be53f846b7cdc6273488fd488 SHA-256: cca6fd5508fbb025bad9fb66f635d91052b53ca519bd67b47e0f1d44c9b3417d
184 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 link to a known malicious redirector, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although the document body is heavily obfuscated, the presence of a malicious URL is the primary indicator of compromise.

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 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.
  • 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/strik?utm_term=bible+emergency+numbers+quick+reference+guide In PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/2640866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374373/normal_5f8b4dbc9b2d7.pdfIn PDF document text
    • https://razolonupul.weebly.com/uploads/1/3/4/8/134888498/9331828.pdfIn PDF document text
    • https://xotoxagat.weebly.com/uploads/1/3/4/7/134753993/dadupovamakako.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_5fa88ffc4738f.pdfIn PDF document text
    • https://babujotiju.weebly.com/uploads/1/3/4/7/134751526/wakaj_pudobutevul_gukevisadilap.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc678639698b02c7f46ff01/t/5fc72cdbad3e64119240bbee/1606888669329/51051042628.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/43057188205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4e46d2-cb24-45f6-ad7d-c16ed1a8fd04/mega_man_bass_rom_snes.pdfIn PDF document text
    • https://s3.amazonaws.com/wisuw/4_weeks_pregnant_ultrasound_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34d9ca73-4a92-41d3-9ed8-a9ad0d019bc2/vabiwozowis.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/arthur_schopenhauer_libros.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/57535545249.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3E 5612 bytes
SHA-256: 641c029911ad44c0a4e9421bfba9b81f9a5143a5b28b3eba3fc19f168e6367a3
font_01_sfnt_off00014150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14150 10780 bytes
SHA-256: 7a741ed48a98c44320cd747d0ab92347a716a039bb97f86666aa7b056f848b5d
font_02_sfnt_off00016649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16649 16116 bytes
SHA-256: c804f2d26ee063b8343e0cb63cb1e198baaca611fd3f5d732c0de70d7582e6af

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