Malicious PDF — malware analysis report

Static analysis result for SHA-256 76997067b7ac98ef…

MALICIOUS

PDF

77.6 KB Created: 2021-05-19 09:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d580b337416aa4773cb7103e5b13f108 SHA-1: 700946eac84fd7c0609bc3a3459c049b7ac2f9c7 SHA-256: 76997067b7ac98ef3472056538ac52920f2486747ebb34e0492a8a221fd4f5d0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://botokaw.ru/strik?utm_term=how+to+determine+if+reaction+is+endothermic+or+exothermic PDF link annotation
    • https://luzurojavozajin.weebly.com/uploads/1/3/6/0/136090511/cbd2074ab6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383802/normal_6035b11cc1174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_606b9c25c1643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5fd136dbc53aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_6001f449dbfad.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/vupaxalezer_pojebad_niviwozo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_5ff1d8d08648e.pdfIn PDF document text
    • https://bunonosuvon.weebly.com/uploads/1/3/5/9/135976801/suxawetutigafoxur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_6027ad0c96d46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_604cc6d56cd56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414332/normal_600f9e2c99b70.pdfIn PDF document text
    • https://zibinileder.weebly.com/uploads/1/3/4/7/134748255/9125868.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459774/normal_5fe6d15a53bf2.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/9558670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6054c2f08cd29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kawotexulozax/49434822769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a4b7108-4b6f-496d-a45a-3723be916d63/38129766206.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/butapukafigizosuvewawun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8911d77-64a3-4a5a-982a-f53720f9416b/formuler_f4_turbo_set_top_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c87488e-2264-4469-9176-84ce167e2423/21832139211.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_off0000e5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B2 5140 bytes
SHA-256: e04f4b6e06e4f6d84d0398950f7385df33372fc395e3dd696b53793195a18f01
font_01_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 10260 bytes
SHA-256: 34ab99fc677ecddad6fd8bc92394c3ce8948740d2f6bf8efc0fb66286e23a12d
font_02_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3