Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca102cf60e1c555…

MALICIOUS

PDF

76.9 KB Created: 2021-05-10 08:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d49ffb1dd940503e86092a2c97f3367f SHA-1: 1de0992564640cf45c84a5c5094f80297e49c74f SHA-256: cca102cf60e1c555c7cbfb49b147d3d0d64542364573f5cf33f8da3ddc7ad270
186 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 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=the+art+of+unit+testing+pdf+github PDF link annotation
    • https://pafuxasakilufa.weebly.com/uploads/1/3/5/3/135327400/83cd400846e4e0.pdfIn PDF document text
    • https://lefeputabewaro.weebly.com/uploads/1/3/2/6/132695219/lixajekajisezi.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/hoYT8jh/digital_trends_2020_uk.pdfIn PDF document text
    • https://tilafiranude.weebly.com/uploads/1/3/4/3/134314128/3557249.pdfIn PDF document text
    • https://cdn.sqhk.co/koxuzofu/ujiTX3U/67715409760.pdfIn PDF document text
    • http://rimujitibux.mypressonline.com/10428603792.pdfIn PDF document text
    • http://zisesiso.22web.org/pamavifukavupexilozedug.pdfIn PDF document text
    • http://xufelaketodo.getenjoyment.net/health_assessment_form.pdfIn PDF document text
    • https://famepajovajegow.weebly.com/uploads/1/3/1/4/131438188/benotor.pdfIn PDF document text
    • http://nonowun.mywebcommunity.org/body_dysmorphic_disorder_questionnaire.pdfIn PDF document text
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/xuxefigemokajolununo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_94b6c58efa024f2491a00b599d5b52cf.pdf?index=trueIn PDF document text
    • http://midelex.epizy.com/74346777281.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_ef8e3740359443d2baad3e506d2a4fb0.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_1396a46e568a41e698665e83fc7f3944.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_ba81de4bcb204f22ae6c7b0a57afc7f5.pdf?index=trueIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_b4a5fb37d8e941d882352df7fbfeeaa9.pdf?index=trueIn PDF document text
    • http://nukivamo.myartsonline.com/69133624316.pdfIn PDF document text
    • http://fojijiguvixano.rf.gd/mutimuradu.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_off0000ecee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 5360 bytes
SHA-256: 7c13ca7b5d170ee490c2dbffa7733b792d04b0ad1c6fc0eb3b3a86cfafe6950d
font_01_sfnt_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 11412 bytes
SHA-256: 8061c96be63be779895d02b0563f02fa8d30d440e830f4053b4b5c72d9cb861f

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