Malicious PDF — malware analysis report

Static analysis result for SHA-256 121c442505cbcdd0…

MALICIOUS

PDF

72.7 KB Created: 2021-02-16 01:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1c96022301b798006f1ace7f7235d59a SHA-1: 30b39db9f65c8690bbf694924778cecf25a13ac7 SHA-256: 121c442505cbcdd01e1d94f3f07e09cd5e04869161cfab6896484b029dea4fba
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO spam or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/wix?keyword=csi+algebra+solving+equations+answer+key PDF link annotation
    • http://autoport76.online/datoniwufozewenwp4d.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/tulejelizutobi-mogad-voxovoled.pdfIn PDF document text
    • http://loginwithfb.site/guided_access_not_working_iphone_xgfq5i.pdfIn PDF document text
    • https://bisetegu.weebly.com/uploads/1/3/4/5/134528498/3438c8.pdfIn PDF document text
    • http://edalovert.xyz/racial_and_ethnic_groups_13th_editiony9mam.pdfIn PDF document text
    • https://wuselusovofose.weebly.com/uploads/1/3/1/1/131164562/a13031e550b13b5.pdfIn PDF document text
    • https://zawoluzowusemad.weebly.com/uploads/1/3/4/6/134697528/9055284.pdfIn PDF document text
    • https://figovuliwa.weebly.com/uploads/1/3/4/4/134476313/tilojasowune.pdfIn PDF document text
    • https://ripufimavewin.weebly.com/uploads/1/3/6/0/136099474/dapeb.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/wijedotapeg.pdfIn PDF document text
    • https://ninisezidopif.weebly.com/uploads/1/3/5/3/135391617/5739046.pdfIn PDF document text
    • https://zujujogonawanuk.weebly.com/uploads/1/3/4/8/134879196/9027512.pdfIn PDF document text
    • https://tipuzinugex.weebly.com/uploads/1/3/2/6/132682040/4342001.pdfIn PDF document text
    • http://senteber.site/3384135205fy7qt.pdfIn PDF document text
    • https://retedavaliloxi.weebly.com/uploads/1/3/5/3/135393755/ae74ecdd503fa.pdfIn PDF document text
    • https://zatenumidepav.weebly.com/uploads/1/3/0/7/130776458/pawimewafo.pdfIn PDF document text
    • http://digtalcaliper09.xyz/acute_appendicitis_guidelines_2019xghfr.pdfIn PDF document text
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/267b8c5d97c.pdfIn PDF document text
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/5308535.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 5344 bytes
SHA-256: 775bb4687fb4034c41875207322c2b2066a72bcd111974777f1ccbf07d563bab
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 10624 bytes
SHA-256: 2e79281bad68211325fea29c718c20d1ca2eacbb80782e2fd4750863ab9dd429

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