Malicious PDF — malware analysis report

Static analysis result for SHA-256 0524a42ebbe8c18b…

MALICIOUS

PDF

80.7 KB Created: 2021-06-10 04:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f10ea23e779f60b12674188a116ff40d SHA-1: 2339bdfb3a0aaecae989e3655e59ce8c9f714c6e SHA-256: 0524a42ebbe8c18be08cac3a9b3071dc9b5af1a1eaa2da3daf714134ef16da1d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://synerhu.ru/pbw?utm_term=ornamental+fish+industry+in+sri+lanka+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374979/normal_60bf33d763138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_602c42e64841d.pdfIn PDF document text
    • https://toxozuduz.weebly.com/uploads/1/3/5/2/135295771/talegukam.pdfIn PDF document text
    • https://pedigibija.weebly.com/uploads/1/3/1/8/131857049/e0483265.pdfIn PDF document text
    • https://jerewetazawupej.weebly.com/uploads/1/3/4/3/134384555/nuzonabepapor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_6010f3394042d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464297/normal_601ec57397266.pdfIn PDF document text
    • https://bomikuwutivibi.weebly.com/uploads/1/3/4/5/134598741/6470732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494868/normal_6044011fa4bae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kemususi.pbworks.com/f/pabalusejope.pdfIn PDF document text
    • http://numefen.pbworks.com/f/tangled_full_movie_in_tamil_hd_free_download_in_tamilrockers.pdfIn PDF document text
    • http://molujox.pbworks.com/w/file/fetch/144891480/btmm_indicator_free_download.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/144595290/kinidamimurifaxirepil.pdfIn PDF document text
    • http://wuvebag.pbworks.com/f/argumentative_essay_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b358af44-fb61-43d6-b45f-d3ae8b686f69/stanley_wet_dry_vac_8_gallon_parts.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/vanenasiduwakowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787c2b5b-2bc0-42aa-9ddf-a539c8121e56/78664509584.pdfIn PDF document text
    • http://wurogakitibe.pbworks.com/w/file/fetch/144645849/auglaize_county_recorder_wapakoneta_oh.pdfIn PDF document text
    • http://pafesudive.pbworks.com/w/file/fetch/144812904/jotiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563d5ef4-e3ed-4fd3-9ef2-d2fd56365835/brandon_sanderson_wikipedia_pl.pdfIn PDF document text
    • http://japomajuxire.pbworks.com/f/pijafarixav.pdfIn PDF document text
    • http://gezebal.pbworks.com/w/file/fetch/144983235/clash_royale_private_server_2020_download.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144416433/famous_quotes_on_friendship_in_marathi.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/f/wetugara.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144468717/cuadernillos_de_caligrafa_para_imprimir_gratis.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144967749/phrasal_verbs_with_bangla_meaning.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF944 5472 bytes
SHA-256: 19eb5451188a0c225141b680cd0a1458cbef0e37c91843f12f30e863103c3e84
font_01_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 11644 bytes
SHA-256: a04172bd91848d2b9a9a9310ac039b1a545512fb8e85db4ad72d2ce16dd336a4