Malicious PDF — malware analysis report

Static analysis result for SHA-256 d261c3446fd7b0e5…

MALICIOUS

PDF

81.4 KB Created: 2021-04-23 17:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 48b4dfec3c0a854de6e7b0eb7710f4ea SHA-1: 330b963d92b2f1ec2e598386a3b1ddcbd3072ee7 SHA-256: d261c3446fd7b0e558c7ac6a3c9a0bc84db944a999fbbba260a22c8ad2f6bfe0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious content, specifically a phishing or trojan threat. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://fokemale.ru/strik?utm_term=120+lessons+%2526+360+degrees%252Fbooks+knowledge+of+self PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445737/normal_6066d5464d9d2.pdfIn PDF document text
    • http://widaxaruko.mypressonline.com/aeronautica_imperialis_2020_rules.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_6004f828964f1.pdfIn PDF document text
    • https://puralabeno.weebly.com/uploads/1/3/2/8/132814071/suzebu.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/e58493.pdfIn PDF document text
    • https://barijimuje.weebly.com/uploads/1/3/1/4/131406344/rexepoxumi_todixenuxegipe.pdfIn PDF document text
    • http://jalojewaga.mypressonline.com/vakeziwezo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369519/normal_5fefe7fd61a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494451/normal_604a10354bb96.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/6485300.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491705/normal_5fef68425856a.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/dubikozobibewaretitabejov.pdfIn PDF document text
    • http://janipuwibir.mywebcommunity.org/child_growth_and_development_stages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_603e330fce0b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_606142b0ba415.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412159/normal_5fe112961e333.pdfIn PDF document text
    • http://lalikexitaxixix.getenjoyment.net/aqua_regia_gold_refining_process.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/lemizuwubuzujazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495685/normal_603a0fc3e8293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489422/normal_5fe5f5e0a6f07.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/konica_minolta_bizhub_c227_brochure.pdfIn PDF document text
    • http://gisujug.mypressonline.com/jolapamuwavurude.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/97318781451.pdfIn PDF document text
    • https://sarejazaxixosib.weebly.com/uploads/1/3/4/6/134633098/rumogetex_nivoja_bavepolivixope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421224/normal_5ff3f0d54488e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450256/normal_600f0884c9a2b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495264/normal_5ff55c1aa2509.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 4264 bytes
SHA-256: 9a8d4f81cae71cb19c73c2098fc53c5cbe9b55a2a1fd5b300fed45d0169bb825
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 12188 bytes
SHA-256: 8829573b9b005330d390c1b6b2ff007f8618b6cc4a6851edf2d514c8554d6292
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2