Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a105af21cc474b…

MALICIOUS

PDF

68.3 KB Created: 2020-12-17 22:24:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 898acdecd037955594c5ff2feac6413d SHA-1: e02fa00a83622a00d1271caf3049bbb9e1425a72 SHA-256: c9a105af21cc474b394efcdb1c2e8a3df5bdbfa009ad913d054a6fa0753f45a7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is part of a link farm designed to direct users to malicious sites. The primary URL, 'https://traffnew.ru/aws?utm_term=real+estate+appraisal+form+1007', is presented as a real estate appraisal form, likely a lure to trick users into visiting the site. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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://traffnew.ru/aws?utm_term=real+estate+appraisal+form+1007 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fa868287cee7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413119/normal_5fc8af4811729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fab0a7f7eaf7.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/gegakunagakamet-wipumidujo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_5fb5db8175fa0.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://static1.squarespace.com/static/5fc57b2d6609fd0ee7b07d3c/t/5fc62736eaf37e3b646e1847/1606821687558/ufc_news_conor_mcgregor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677172b0-e3da-404a-997b-a903ec449135/tekadoravijuxoduzariloto.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7a0a9579eee3ae06ee35c/t/5fcee71724ae147ef3cfaf80/1607395096639/shake_shack_menu_prices_palo_alto.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/de_leon_mexican.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23cc2e9-d3f8-48d3-9c0b-3e054b38a5bd/35391632809.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc654e0affbf90a660f952b/t/5fd65633ab777271768d3114/1607882292241/fujuzomavufefolutajigijor.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6bbbad64a3343a5f3c99d/t/5fd21397a9eaf43bd85b7d69/1607603096905/fosedopukasurixuwepudukab.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0de9c5bcb0228a2825217/t/5fd15022ef144d1e543cefca/1607553059242/background_eraser_apk_old_version.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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 5008 bytes
SHA-256: 13e5d5810d09a85a0e093dbd9cc77ac5259253c2a3273ecfb90d5aea97e05990
font_01_sfnt_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 9876 bytes
SHA-256: ec3db5769f755e9f3df017e5c305e0bb96ef7b1eec6390e80c15b46b63ffe17b
font_02_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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