Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff128fd29e2947eb…

MALICIOUS

PDF

97.9 KB Created: 2021-02-20 02:11:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 965b7f34d9d2e4c761f2db4ff8c9035e SHA-1: 277ffc4747e3a391fb8727100fb10f806e6850d6 SHA-256: ff128fd29e2947eb4701eb9f078305c6c8a9ec8f5e2edd71d3cc5febd7ac40c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used to create link farms for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with specific detection as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic point towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://baarspo.ru/123?utm_term=restatement+second+of+torts+section+46 PDF link annotation
    • https://sixisamut.weebly.com/uploads/1/3/5/3/135308299/eb7e9d6e1a992.pdfIn PDF document text
    • http://reactivaperu-2020.com/44356105730t4eei.pdfIn PDF document text
    • http://healthit.space/vans_old_skool_mens_size_10.5v05kc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447436/normal_602ecd6f8e642.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467561/normal_5fe08cb810051.pdfIn PDF document text
    • https://nepubodi.weebly.com/uploads/1/3/4/6/134610278/wuxidokaremuv.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/foxeg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417325/normal_5ffda68ee9f92.pdfIn PDF document text
    • http://detonic-ro.website/83453478983p2dzm.pdfIn PDF document text
    • http://com-signto2.xyz/app_video_cho_iphonefkhei.pdfIn PDF document text
    • https://xasamaxubema.weebly.com/uploads/1/3/5/3/135387487/8938232.pdfIn PDF document text
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/9796021.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
    • https://s3.amazonaws.com/wavunot/rawuxirilevepepovofa.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/41327168372.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/87034614904.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/8th_grade_science_textbook_mcgraw_hill.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/recomendacion_cndh_caso_ayotzinapa.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/battery_charge_controller_android.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/bobofexatogeka.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/10439158521.pdfIn PDF document text
    • https://s3.amazonaws.com/jusagi/26222126749.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/27819981438.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/balance_sheet_format_according_to_gaap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 5172 bytes
SHA-256: 2c5300713db09659b5abb41665b67f83d7d4405c5427d1f448f02eec7f2d8e30
font_01_sfnt_off000145a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A8 11060 bytes
SHA-256: 8d9786620da39966dfae49c4bcade3019b106594bdd9373bfed78e9e74b08ddc
font_02_sfnt_off00016b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B8D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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