Malicious PDF — malware analysis report

Static analysis result for SHA-256 035ffa7cfbe315d8…

MALICIOUS

PDF

65.5 KB Created: 2021-02-24 06:49:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 99f3af0ad181470caaf0315ecaff7ba3 SHA-1: 9ccdfcbfeba22e1582afd2cc9ebb8acc9ea48ccf SHA-256: 035ffa7cfbe315d8586c0634c4feaf0a76c51deeb6211c5571986757ef7f6596
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 it as a link farm. The primary URL, 'https://seumenha.ru/strik?utm_term=drawing+linear+graphs+ks3+tes', suggests a lure related to educational content to entice users. The presence of multiple Weebly and S3-based links, some pointing to PDF files, indicates a potential distribution network for malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

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://seumenha.ru/strik?utm_term=drawing+linear+graphs+ks3+tes PDF link annotation
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/b2df8ee4.pdfIn PDF document text
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/kenovir-benamujetizu-mebugetoxik.pdfIn PDF document text
    • http://classicalnaturally.com/kutodonuxanujuwojewunoxeri2qd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_601a05b91cd67.pdfIn PDF document text
    • http://poradoit2.site/51394303858fjrk0.pdfIn PDF document text
    • http://vemusopudin.22web.org/pandora_s_tower_wii.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/452656.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/9e60c4aa4ffa243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470553/normal_602ca5fe8e287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410727/normal_5fd893ce25b74.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/zidosozawok/macmillan_cancer_information_nurse_specialist.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/baron_neue_font.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/20282270524.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/bs_formal_science_uh.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/aristotle_poetics_analysis_shmoop.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/vutinukafesowinefusepu.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/886634020.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/buremimazesuvor.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/60719274138.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/90768840554.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_off0000c267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC267 5400 bytes
SHA-256: 1286483694800ae8cb4c3fa6ced020d16fbf3ff80e5f4c918b3359df386338de
font_01_sfnt_off0000d4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 10500 bytes
SHA-256: 4a59ca15f2d69ebdefb8fa4439646a795a940d1e7ea045c96c0f034612c3b928

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