Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbb5ed01177fbb8…

MALICIOUS

PDF

74.8 KB Created: 2021-02-23 04:10:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 228158a0a0912751b30dbe43d415746d SHA-1: d2d7bb46f3b88e68571572328d20cf0c24728dbc SHA-256: afbb5ed01177fbb877a9fae14abdc6118621de4b84f479fd748bdf65cec4f082
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to link farms and disposable hosting, suggesting a phishing or SEO manipulation scheme. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/wix?keyword=splix.io+unblocked+at+school PDF link annotation
    • http://medyayazilimtr.com/silent_hunter_5_mods_alles_freischaltenzr7hr.pdfIn PDF document text
    • http://websporizle3.com/ms_powerpoint_download4xhba.pdfIn PDF document text
    • http://itdomen.fun/adventure_capitalist_cheats_ios6pqm0.pdfIn PDF document text
    • http://bedebatosisazov.22web.org/49564906321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_60149ff149d47.pdfIn PDF document text
    • http://flipping-car.online/febotegikomoduwuzaveuo1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_6014963a93013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418985/normal_60326728b7468.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497369/normal_601241aecb67f.pdfIn PDF document text
    • http://cashbackk.site/61508400771lkwiz.pdfIn PDF document text
    • http://getsalle.xyz/huskee_snowblower_parts4fns9.pdfIn PDF document text
    • http://sanamikegimelab.22web.org/arrange_fractions_in_ascending_order_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_6015ad80b400e.pdfIn PDF document text
    • http://pelistens.xyz/the_essential_epicurus_epubbrjgq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480182/normal_601cc4383b0f6.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/semuxemakaw/sql_injection_php_form.pdfIn PDF document text
    • http://roxonotagake.rf.gd/irian_jaya_blue_tongue_skink_care_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tudawufed/wodasiwotiwabovagufax.pdfIn PDF document text
    • http://xutuvom.rf.gd/yii2_activeform_pjax.pdfIn PDF document text
    • http://samanoniminowut.epizy.com/cabo_san_lucas_fishing_report_november_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/lagu_boyce_avenue_perfect.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_off0000da35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA35 5356 bytes
SHA-256: cb8945f80d1da3dda980fb6b459ba62fe5860d0c51b9c35d139f95de75473377
font_01_sfnt_off0000ec5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5C 10476 bytes
SHA-256: 2665263d6ca9aa90ac454a0cba52c6bcec899271042c4e4ee5b761f4874c3c36
font_02_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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