Malicious PDF — malware analysis report

Static analysis result for SHA-256 e823542d93185aea…

MALICIOUS

PDF

69.9 KB Created: 2021-05-16 00:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a38a48a161bc348f56191a54ddf6f418 SHA-1: bd34d25ce6676c27501494743d5a118bd4822b7d SHA-256: e823542d93185aead6edfa2ac2c9ce875ed3d29415c0f27a70d8c0b07a9d6272
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links on potentially disposable hosting further supports a malicious campaign.

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://nipisod.ru/strik?utm_term=earthwise+lawn+mower+parts+canada PDF link annotation
    • http://pro-konditer.com/wajugogarimudozolabenau1.pdfIn PDF document text
    • https://mibugekokedepi.weebly.com/uploads/1/3/2/6/132682655/3912dde1b93a.pdfIn PDF document text
    • http://wexebigusokata.iblogger.org/44094716692.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/juxexeneguwas.pdfIn PDF document text
    • https://felupujefokedab.weebly.com/uploads/1/3/4/6/134621420/9044483.pdfIn PDF document text
    • http://reestr.site/34470111412jnp6l.pdfIn PDF document text
    • http://basvuruizleme.online/how_do_i_get_my_brother_printer_to_scan_to_my_macbook6cppk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_b0f118ccde3148428c2c31c77dbfdaa9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6afc06-f04f-484d-bda1-22975552119c/lean_certification_cost.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_a861061282c744e8af169aaa33205cf9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a584dff-d162-4411-9060-bc9c34ad3909/66970275713.pdfIn PDF document text
    • http://mekamaxabojumoz.epizy.com/best_korean_dictionary_app_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6815ef60-4dcf-41de-a94f-51745d289ca6/xipanozi.pdfIn PDF document text
    • http://rutefepojurew.epizy.com/causes_of_myocardial_infarction.pdfIn PDF document text
    • https://21dbc830-6d60-48ad-8ab0-00d2b3cb69e0.filesusr.com/ugd/18d949_ed06817c57c7492cbb7c57b43c784f09.pdf?index=trueIn PDF document text
    • http://valajawegob.epizy.com/check_license_status_scdmv.pdfIn PDF document text
    • https://d04c2b29-3777-4fe6-aaa9-ab96f87c3324.filesusr.com/ugd/43eb95_dcb4ccb5aa9546b185d4bda435599a41.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_c3ce4c4d790a4646aeb3b44a28aad349.pdf?index=trueIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_182d6bc0ae454c168a94b16098d7b7c5.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_aa4327df4d7341d69031cba3d606c56c.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_off0000d485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD485 5364 bytes
SHA-256: ab1e9b608b581676af5b6a79960b34a4ba5ba1afd67c6aac20d0459ce3dabcde
font_01_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 10536 bytes
SHA-256: 20b16a6629983d960c737b66cf0a48b54ee7f018b38c842f98c6a34acde79f52