Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef882e388cce0e77…

MALICIOUS

PDF

76.7 KB Created: 2021-02-17 00:46:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ed261eca8750016b344821967a9e44b SHA-1: c64f23f89ad18dd2e265a8d5f1e32fecea278056 SHA-256: ef882e388cce0e779b7882a60719eee19b5052fad43e1c77ae029039bd1b21c3
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain keywords related to generators and application names, suggesting a lure for potentially fraudulent activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=freealts+fortnite+generator In PDF document text
    • http://zevuzigix.iblogger.org/9393476593.pdfIn PDF document text
    • http://ziguzuxudatigu.22web.org/amigdalitis_bacteriana_colombia.pdfIn PDF document text
    • https://lisiruzefixa.weebly.com/uploads/1/3/4/4/134495270/semavufililatut_jepasaxo.pdfIn PDF document text
    • https://lerasakob.weebly.com/uploads/1/3/2/6/132682990/vunapi.pdfIn PDF document text
    • http://kezekimoridim.22web.org/54235956538.pdfIn PDF document text
    • https://voxonororipesap.weebly.com/uploads/1/3/5/3/135383222/5227619.pdfIn PDF document text
    • https://tajaxaxiko.weebly.com/uploads/1/3/0/9/130969751/3797476.pdfIn PDF document text
    • http://lizetadolanut.iblogger.org/lefatinutemi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lozurituga.rf.gd/canon_lide_220_scanner.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/fulesixuwiselimeguma.pdfIn PDF document text
    • http://menosupas.epizy.com/fishing_report_richmond_va.pdfIn PDF document text
    • http://rafodize.rf.gd/aufgabenstellung_formulieren_englisch.pdfIn PDF document text
    • http://zinipaxafuzonik.rf.gd/bustin_neil_cicierega.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/muxobadotoza.pdfIn PDF document text
    • http://rupadulogoliwid.epizy.com/discharge_planning_checklist_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/bill_of_sale_form_car_oklahoma.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_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 3136 bytes
SHA-256: d178bc7365be781b9374ab51aafe4061f53e18b75aefca28d56a17cb9b8bc056
font_01_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 4892 bytes
SHA-256: 06f5730dfe9015a78b9d48c8f274881f91c6c0592a826945cddf457b949def66
font_02_sfnt_off000100d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D2 10592 bytes
SHA-256: 27fba82f1435391da170e19cb27b4178b306e11a873bd80b37c4f980ffe5fab7

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