Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b827acf62e7362…

MALICIOUS

PDF

89.3 KB Created: 2021-03-05 21:33:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 75607f85c1ec4c3fbf3916087e759f0c SHA-1: c8110fc97567d6a2f3b7a1ce6dc30cedabd11941 SHA-256: 00b827acf62e73622f0e582bc880c7e33570863d2a368e8cb2c5d924370d4e11
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

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://jacksth.ru/aws?utm_term=types+of+urban+land+use+models PDF link annotation
    • https://mugifafuvutasij.weebly.com/uploads/1/3/4/1/134108805/voxijite-masaw-jonaliv-pumubo.pdfIn PDF document text
    • https://vakumijajuxos.weebly.com/uploads/1/3/4/4/134465568/019253cb87d56.pdfIn PDF document text
    • http://kopolade.22web.org/8222580683.pdfIn PDF document text
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/pikopafarukij_tekuvejokijufug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ad1392-8d13-4185-8527-2da83a330718/famuxixevujipagupa.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/nipitukokoloxipapaban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a2b7bb-3f22-4725-978b-8fe3330f72b5/funciones_del_sistema_endocrino_y_sus_partes.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_2cb3f089ac0648c0a5f2aacaf206ff63.pdf?index=trueIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_bcf7553450b5437d9a3c9fb3e37ebc08.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa0d8bf-9b96-49d3-bc96-ab1ce311b955/how_to_change_the_time_on_esi_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/graco_lauren_classic_crib_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b569447b-7dfa-416b-976a-033da61ca754/tafivatam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/911fcfd0-d6a1-4576-a23d-360d599cf93c/49923533199.pdfIn PDF document text
    • http://matogojetize.rf.gd/recetas_de_carnes_rojas.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_2de40dccfafc48559b85b06c94459dae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/24d648f5-081b-4493-a096-2cd35e8a4415/how_to_change_aimpoint_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/98081055070.pdfIn PDF document text
    • https://8a6b9437-e7f2-49d7-8c24-351b272aa67a.filesusr.com/ugd/b18e4d_611484ddc9394c399ea8cd78c8a6ded3.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_bc2b20a3d86945fbbf964a43d5cacd80.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_off000121aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 5380 bytes
SHA-256: 6a4f6bc5d183a91051261928de1e35df8adc175e1351e18d8cfeb74390ad598b
font_01_sfnt_off000133dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 10720 bytes
SHA-256: dd10a1c91ffe5ed2a53ce9170c511256247d95dac8c5d1293269f023565692d0