Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ec8e91cd6fa5bb…

MALICIOUS

PDF

70.7 KB Created: 2020-11-18 12:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fec58b49006d3560d73c8e631ef14cad SHA-1: 7ba2c951981d65f8ca28f1d8d5e374a6f2a8e05c SHA-256: 42ec8e91cd6fa5bb4053fca87f469cca95fd2e7122ed095402869774805bdd12
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to direct users to other PDFs. One prominent URL, 'https://trafffi.ru/aws?utm_term=demographic+segmentation+pdf', suggests a lure related to demographic segmentation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=demographic+segmentation+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482020/normal_5faf6f1b32ec7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f8c95ecb0e3d.pdfIn PDF document text
    • https://fekalebewobazo.weebly.com/uploads/1/3/4/6/134668576/5031532.pdfIn PDF document text
    • https://nawitesusamu.weebly.com/uploads/1/3/4/4/134480899/9ea83b.pdfIn PDF document text
    • https://bitifuzafaf.weebly.com/uploads/1/3/4/4/134488734/sonixamakogu.pdfIn PDF document text
    • https://nagopajasire.weebly.com/uploads/1/3/4/3/134311949/xarusogefe-vibimafifadepo-sidixipijivuwos-pegugobumovaje.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/paxivogedewilu/jofabidexamoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ecf7e68-2533-45b9-bd64-1ac146bb8a3e/54528322118.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/editable_2019_calendar_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/arvada_west_hs_baseball.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1005012-5fe9-4476-8c1f-d83c5797717a/disafimof.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/eastlink_tv_guide_sauble_beach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/824221a9-9dc4-4b52-a658-955767cad3c4/xidakujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b76d5271-e901-4180-b540-d4643fcd9155/fizeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/843cc647-d6e2-4f0d-b9d4-34c9ae25365a/pmt_252_module_1_exam_answers.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_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 5536 bytes
SHA-256: b60ca516b26ce42b5c768f1a93d5a7909f2e11e3b2c31ba60a183572d4301525
font_01_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 10284 bytes
SHA-256: 538913bcfdccada24f6a8d585ef5f6ba33646f413d5ecf700e46507c1c32feda

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