Malicious PDF — malware analysis report

Static analysis result for SHA-256 feaf574b16968fd7…

MALICIOUS

PDF

68.8 KB Created: 2020-12-01 04:50:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: cc5ad88a87dfed47669e13454f0a48ad SHA-1: 5e7b5a583cae9b425a4019fe2e8b06968f5e164f SHA-256: feaf574b16968fd7bbe0711b1f96b23ff316ee00c050e55b2c1a84b287916e82
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic firing for a PDF link farm. One URL points to known malicious redirector infrastructure, and another is part of a large set of links to PDF files, indicating a potential SEO manipulation or phishing scheme. The ML classifier and ClamAV detection further support its malicious nature.

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
  • 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=first+break+all+the+rules+12+questions In PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/5697579.pdfIn PDF document text
    • https://zesukixugedun.weebly.com/uploads/1/3/4/5/134593530/mojukiwutizafuzo.pdfIn PDF document text
    • https://bijimuxe.weebly.com/uploads/1/3/4/8/134886115/kevimosajef_gurozav_tasovirulon_korolupu.pdfIn PDF document text
    • https://fefajuvojamunuj.weebly.com/uploads/1/3/4/7/134750085/rorofokosu-kaxali-siwoluxopokaxik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_5fc0ad993e9b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389370/normal_5f8e700285ee5.pdfIn PDF document text
    • https://rogujodur.weebly.com/uploads/1/3/4/8/134899240/1186e3b1750ccac.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/jepinebawo/narrative_paragraph_examples_about_food.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/84310888824.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/307619d7-bb74-4652-a8f7-a39b977c2fbb/ximorobenezafufonoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41327e96-e2dd-48e4-b75a-4251cda29fa8/68774232867.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbda5a5d-5cc4-4f33-9250-6bb389eca9b4/glencoe_mathematics_grade_8_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/i2c_vs_spi_vs_uart.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/samsung_360_camera_invisible_stick.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 5244 bytes
SHA-256: 0def7752c65b25475e52ef3df627e613a161177fcb9f0e18a489b5dcbc2455ab
font_01_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 1800 bytes
SHA-256: daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
font_02_sfnt_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 10104 bytes
SHA-256: c370a93aa3eeccee2e68c12b36b8390032c07dc6c4f0f2f83b0b3e6965704e17

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