Malicious PDF — malware analysis report

Static analysis result for SHA-256 57688d58fe7e651c…

MALICIOUS

PDF

82.4 KB Created: 2021-03-09 12:11:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 87f3191bb0adb948d3c9345a106aaf20 SHA-1: def92c3fedda4cb745533b76eadcef583d8d3545 SHA-256: 57688d58fe7e651c23846f1ccbfe269a5d55818e17607084e4235e4467d82122
186 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, and contains a large number of external links, many of which point to disposable hosting. The document's content appears to be a lure, using a seemingly innocuous topic to direct users to a link farm. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest potential for malicious JavaScript execution or redirection to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://leonvi.ru/strik?utm_term=black+men%2527s+short+haircuts+for+thin+hair PDF link annotation
    • https://felezawobo.weebly.com/uploads/1/3/4/8/134896203/subaviveraj-zewur-mufakona.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470402/normal_5ffca84507d88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_6037fded5fc3e.pdfIn PDF document text
    • https://lemuwepino.weebly.com/uploads/1/3/2/7/132712354/6baeb1d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_6036c8b4b5743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449178/normal_603aa7f88518f.pdfIn PDF document text
    • https://rubajamepufukav.weebly.com/uploads/1/3/4/4/134432722/gesaxe-zukixarevedan-sobitoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456667/normal_6035a3fb4963e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5fe8581001e9e.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/5777619.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488809/normal_60083a03e2632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501993/normal_5fe303abbe98c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_62290a9cdbb047829082120b1bca0861.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_e8afe6796547461f9e9efde3215d9697.pdf?index=trueIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_82a2246a56204453899b5887b323bb5b.pdf?index=trueIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_a33ccb1e9b95414d80416cc4281d0c8d.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_ced94a2cc33d4253a513c2fc0f9aaa43.pdf?index=trueIn PDF document text
    • https://b00f38ea-0d13-4519-ab0f-1253f0d03ca0.filesusr.com/ugd/289c5e_96ce4e5f37c2450d93ff7a7b7f07e875.pdf?index=trueIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_da3cde5706c84faca09a682a33c983a0.pdf?index=trueIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_f9d60d9b644342c79d1e4bfbf0987c21.pdf?index=trueIn 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_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 5268 bytes
SHA-256: 180b0c387368c5388cb91dfe279a4363afcf2384a0f2c6e71d3e0139a35e5a45
font_01_sfnt_off000116d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D3 11144 bytes
SHA-256: d58c638634012f1199dbbd50f828dc43b75d1c6e2e2455f6119ddd66cde6c927