Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39dab320e02354c…

MALICIOUS

PDF

70.2 KB Created: 2020-12-14 15:40:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 3811734dee499998bce92a01850eef6f SHA-1: 84b1916d6da16dfd3781641ac6aab551014a09f5 SHA-256: a39dab320e02354ca9095e1adf619216fdde811fda00ec9deca58f764e70294d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed for SEO manipulation. One prominent URL, 'https://trafftec.ru/aws?utm_term=canada+immigration+form+imm+5645', is presented in a context suggesting a lure related to Canadian immigration. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is weaponized to host and link to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/aws?utm_term=canada+immigration+form+imm+5645 PDF link annotation
    • https://tadafami.weebly.com/uploads/1/3/4/3/134386911/7722106.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/didufuwovakufupip.pdfIn PDF document text
    • https://jotevugujuz.weebly.com/uploads/1/3/4/6/134675951/1900406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_5f8e41a7b4e0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380522/normal_5fa4bf6c4209b.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/pibajuwi/rewunelesodopus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebba959-29f8-425a-99b4-4947445deddc/mC3BCrC59Fit_5_indir_C3BCcretsiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9791ba5c-d325-41f7-9425-170542850ca9/19860986439.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6de2be2afa34b64ab27c8/t/5fcf29757379aa359772386c/1607412085823/bugs_bunny_girlfriend_red_dress.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/816583ed-eb45-4504-8b8e-8df172fcffd8/spectrum_tv_schedule_maui.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab3d9ec-4205-4e67-bd4d-f37027e89817/titanic_screenplay.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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 5288 bytes
SHA-256: 1790ae1889b98ecc46d12e7e08b0c3c3f056abd21b2b1ad6ba71a7fd585094d9
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 10532 bytes
SHA-256: c51cf039c14b166417c003ed6322a17ee9beb6b20b8122a030c07423dde96b23

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