Malicious PDF — malware analysis report

Static analysis result for SHA-256 95613527320d2e7a…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 01:44:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8d148bf229e347e07562c8f06146b170 SHA-1: ae4ca3becd2905f8f12ab0b2b8c152b9b004ed53 SHA-256: 95613527320d2e7a634ca0dcce3ab3559cb3e006c8bcf0daadd4313c90e61be4
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external links, one of which is a direct URL to a PDF file. The document body, though heavily obfuscated, suggests a lure for downloading content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/award?keyword=download+calvin+and+hobbes+complete+collection+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454432/normal_5fddc741e2c14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_603a238145f60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5fd914a69c2b8.pdfIn PDF document text
    • http://becloud.website/neil_gaiman_amanda_palmer4befv.pdfIn PDF document text
    • https://cdn.sqhk.co/besogevipadi/ibpNqhh/emergency_vet_tucson_broadway_and_prudence.pdfIn PDF document text
    • http://predouche.xyz/honda_5000w_generator_for_saleu1ljm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5fea39378bfc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374175/normal_6024742513afb.pdfIn PDF document text
    • http://korecos.ru/boxupepifobawu95mgg.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/hdgjjge/24752219444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_601c7d000a256.pdfIn PDF document text
    • http://doweryklkq.space/othello_act_1_scene_2_analysis_a_levelj0s8z.pdfIn PDF document text
    • http://usblighter24.site/algorithms_illuminated_part_3_drivemtyg5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5fd1bc302a4a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_9d481c1f53fe49458428f8e37416ac51.pdf?index=trueIn PDF document text
    • https://0efdb04f-128a-4c0d-ace4-8b312723ebcc.filesusr.com/ugd/5508f4_17f3f047739b4c228f4c76e39ca48695.pdf?index=trueIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_1396a6f8021140f3ae5254723b433d90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/lopobadenobuwuz.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/do_mary_poppins_and_bert_get_together.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_d4e700edc7584841a80db2c6f2b5d814.pdf?index=trueIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_197fd92161d648299538b472920787a1.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_off0000e2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B5 5592 bytes
SHA-256: d948e5d6218b6d5a9734815e493ca0ce42b35f574d64fa296ca06d1701726ce1
font_01_sfnt_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 11816 bytes
SHA-256: 10d21a853b1c4be52913c1d6ea4cc7d1bb9bb3b849e8e5d37fa49efa24474e57