Malicious PDF — malware analysis report

Static analysis result for SHA-256 540f5423f2d2db3c…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 03:40:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2573d852797a5adb7e34c817bde35368 SHA-1: 8ddbf073cbeff2743bc5df12e499b4fa8468deab SHA-256: 540f5423f2d2db3cc5563b181ae60f848cbc0a281735662e573c0e165d5a4a0f
156 Risk Score

Malware Insights

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

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 0.9992

Heuristics 5

  • 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.
  • 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/award?keyword=activated+sludge+process+wastewater+treatment+pdf PDF link annotation
    • https://luxaxila.weebly.com/uploads/1/3/0/8/130814132/7a6165cbb01a29.pdfIn PDF document text
    • https://kuwofepex.weebly.com/uploads/1/3/2/7/132740654/tidado-jipux-vonuzujojuror-wamomeje.pdfIn PDF document text
    • https://kixodebu.weebly.com/uploads/1/3/2/6/132682063/sijorizuzipodovu.pdfIn PDF document text
    • https://vipavogezeguw.weebly.com/uploads/1/3/1/0/131069860/ragofiwurune-kijagaf-wudiwip-wiwafawowibow.pdfIn PDF document text
    • https://basalolevezuw.weebly.com/uploads/1/3/1/6/131606508/4828574.pdfIn PDF document text
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/a2f5dde4cc97.pdfIn PDF document text
    • https://fupefodomixeja.weebly.com/uploads/1/3/4/8/134889506/341543.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/d8dc3.pdfIn PDF document text
    • https://tozakewa.weebly.com/uploads/1/3/5/3/135398337/8769494.pdfIn PDF document text
    • https://gapojusegora.weebly.com/uploads/1/3/1/4/131408170/ninudow.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_66b7597680274fb19c3419845b715c27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legesiliv/11476215559.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/roxam.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/hanuman_chalisa_mantra_in_kannada_download.pdfIn PDF document text
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_4008ddf4b43f48248e4af33d07affc04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/wuxojisoxelowanozuvow.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/999_report_online.pdfIn PDF document text
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_2fea816f04b1430a8121ab076d0fa598.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojabixefova/27482381798.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/chroma_key_video_editing_software.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_672fbbc923284830a7a18d81dd5c4cc2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/acronis_backup_11._7_user_guide.pdfIn PDF document text
    • https://d03ec42c-8b93-48d3-a61e-9aee396c0db4.filesusr.com/ugd/1e557c_75c4fba7d2c94e098b373b2142eb45a4.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_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 5616 bytes
SHA-256: 7733c58ab3deaf5689a729bc3b2e15c9ed6915dd76d79ef4f0ca52cfcd43a8ce
font_01_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 9896 bytes
SHA-256: 9016ca3fdbbfcc662d294c6e8212397fb711c088914ea86f0f9531f44442bdee

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