Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc0b5b058024bd7…

MALICIOUS

PDF

80.6 KB Created: 2021-05-15 02:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4723cb46d859c284ef51ffe3c672b851 SHA-1: 10f435f9e3c86b2f635b9f0fd2fb8559ed4122a6 SHA-256: dbc0b5b058024bd7d7178863dbfde042eeaa3134d96c4881faef8ec8511af470
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 0.9998

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 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://mezovuduw.ru/strik?utm_term=chemistry+atomic+theory+worksheet+answer+key PDF link annotation
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/4276092.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/Bujddgj/whatsapp_business_apk_latest_version_2020.pdfIn PDF document text
    • https://menekagamop.weebly.com/uploads/1/3/4/0/134097565/fowase.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/3137503.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/c65d688ae.pdfIn PDF document text
    • https://xusalifur.weebly.com/uploads/1/3/4/1/134131705/fogevanaperatawux.pdfIn PDF document text
    • https://cdn.sqhk.co/wexazaruko/15W6x0n/artillery_fire_sound_effect.pdfIn PDF document text
    • https://cdn.sqhk.co/munuluxel/yZC3gej/popular_hashtags_trending_right_now.pdfIn PDF document text
    • https://fanaraligo.weebly.com/uploads/1/3/4/6/134620410/f444e8802c.pdfIn PDF document text
    • https://revunipaletofux.weebly.com/uploads/1/3/0/8/130874393/3900576.pdfIn PDF document text
    • https://wusafasugulub.weebly.com/uploads/1/3/4/5/134586051/vupugil.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/gihLMyF/jiserakuvagidatutedijig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/joxekutefiwowoxelibovo.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/78918275621.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/zobur.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/toyota_forklift_7fgcu25_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/15616706570.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/71208357469.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/kiwabigawapekofuxupo.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/wapking._com_2018_video_song.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_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 5172 bytes
SHA-256: b38dbc2b85cd84c1727a33e81c8612c8d10ba3ab71b4cc3f7ed6f45b9bf9cd85
font_01_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 11340 bytes
SHA-256: efaf0a0fd6ac920ef50639ceb573d88b228415c97f2c45c2eaa9f91ba5ef54a3

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