Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ee26cb0f1d43626…

MALICIOUS

PDF

79.5 KB Created: 2021-05-31 11:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7552dbcf9cabae7cfca68e11ae92c2bd SHA-1: 384040a6fe89115128db57a44860f9b41b92e7e3 SHA-256: 7ee26cb0f1d43626edfc18bbf4574ab670c2154b20d8dd6cff3c5c71b9869508
164 Risk Score

Malware Insights

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

The PDF file contains a high number of external links, many pointing to PDF files hosted on Weebly, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://seumenha.ru/123?utm_term=best+anti+spyware+for+android
    • https://wevapagavum.weebly.com/uploads/1/3/4/3/134306171/5884201.pdf
    • https://wotewaga.weebly.com/uploads/1/3/4/6/134615540/tawux_fajaresoke_pebujixedasaja_voduvupul.pdf
    • https://gadujixefanupu.weebly.com/uploads/1/3/1/1/131163635/fegov.pdf
    • https://wajizewikibi.weebly.com/uploads/1/3/5/3/135326478/4859364.pdf
    • https://vuvumapidikam.weebly.com/uploads/1/3/4/6/134668868/9666812.pdf
    • https://ligefupoluwoka.weebly.com/uploads/1/3/4/8/134888193/2456115.pdf
    • https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/8f6ca8e3b5ac.pdf
    • https://bivesezuwewosup.weebly.com/uploads/1/3/4/7/134765681/fuvoxesodarewetodel.pdf
    • https://kadenuwu.weebly.com/uploads/1/3/4/6/134674874/gutum_tobakeguvozaz_pekinu.pdf
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/soxazubuji-zabolutirokiti-wusumimo.pdf
    • https://rabesala.weebly.com/uploads/1/3/5/3/135394244/99d2c68a.pdf
    • https://ragikigoludu.weebly.com/uploads/1/3/4/8/134849848/xurovabesawoba.pdf
    • https://lafozevu.weebly.com/uploads/1/3/4/3/134378288/6086759.pdf
    • https://fibunijir.weebly.com/uploads/1/3/0/7/130740490/zisajakanubo-medir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/297d1024-ed29-442f-a488-a4bb7fa38a35/6956249017.pdf
    • https://uploads.strikinglycdn.com/files/437d0915-3bf1-48bb-921d-18e026ba387e/how_to_update_firmware_on_flysky_i6.pdf
    • https://uploads.strikinglycdn.com/files/37a9f957-83c3-42e5-bda8-c99f57ec9c88/goxizoxozevosup.pdf
    • https://uploads.strikinglycdn.com/files/bc4e05b1-d60d-46f0-847e-4223cbe94e9a/does_cruella_de_vil_have_an_accent.pdf
    • https://uploads.strikinglycdn.com/files/db99d312-5b6a-4036-b910-af4c80c2a821/what_u_mean_by_electronic_media.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7df.bin
3106fb5e750b13b2a825ca6b4ce0e8a6aad4cc126fe9415fc41c70cd3a927db7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DF 5248 bytes
font_01_sfnt_off000109e6.bin
5c6c8eb2e6bdc40bc29fe023f5a6eae73ada97aebfc927ce66f8f7f768b05984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E6 10980 bytes

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