Malicious PDF — malware analysis report

Static analysis result for SHA-256 17756fbecb23a849…

MALICIOUS

PDF

77.8 KB Created: 2020-11-18 09:50:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c7b782040e1de424ca861b9f7f3c7320 SHA-1: 0b2972a1fc7ca371956fc513cade408adc3604af SHA-256: 17756fbecb23a8495c4891298b766a6560c2f2ad5f3e93221cd2fd914383499f
96 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary malicious URL identified is 'https://traffnew.ru/wb?keyword=used%20centering%20sheets%20in%20bangalore', which is likely part of a scheme to drive traffic to other sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, possibly related to SEO spam or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://traffnew.ru/wb?keyword=used%20centering%20sheets%20in%20bangalore PDF link annotation
    • https://zokunokakepano.weebly.com/uploads/1/3/4/3/134353677/kujakukovosinikumun.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/lixiwijepavo.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/sotebufamapon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376878/normal_5f91076c0e5d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_5fa2a3345627a.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/rimexajugonarure.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/vunizi/jurnal_akuntansi_manajemen_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/anguttara_nikaya_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/33651705910.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/34702076522.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/nikola_tesla_facts_for_kids_his_childhood.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ff18.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF18 24488 bytes
SHA-256: adfe841254168526b58ce69fd204d5374ea34d71710505b3d029451c668a77aa
font_00_sfnt_off0000c89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89F 5332 bytes
SHA-256: 330682c6d0c89e1143d5124edb7d49aa399b89322892598e4ec15f3c05a0c4de
font_01_sfnt_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10712 bytes
SHA-256: 5e918e95cabb832438fca39a32add5e5e3cb587fb985d560ade1b1235fea3e5a

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