Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d2bce7d82569e2…

MALICIOUS

PDF

72.0 KB Created: 2020-12-22 16:42:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 18a73bb881a1ff25b8f2b6cceb943a98 SHA-1: 10bcb665effd1401d2c6fbec562485504ea664c8 SHA-256: 74d2bce7d82569e2b89027c02f1a20abb69e4e82402c0114f737f78087dc971c
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?utm_term=video+maker+photo+with+music+app+download In PDF document text
    • https://wovuposekase.weebly.com/uploads/1/3/4/6/134613379/sizugimaxapiwez-dafor-raweleremi-nodutomevewiba.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/8018784.pdfIn PDF document text
    • https://paxesejok.weebly.com/uploads/1/3/4/3/134348383/7cd1740a17eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475730/normal_5fad4c383b44e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445745/normal_5fc9c2b47a8ec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc6af419698b02c7f4926e3/t/5fcf114855629615614a4904/1607405897490/sosoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0b3cc9f-6285-4873-8f5d-1f50d971f0d3/miss_awful_by_arthur_cavanaugh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db129e8-7f19-4976-a303-4d79bc4e480f/39476038736.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64ee16b97992eb580530b/t/5fcf0d7eb8233e30dfa2bf84/1607404926727/jawodusene.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/ielts_writing_test_1_answer_sheet.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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 5432 bytes
SHA-256: e08839751e60ad5d725ae91e75fdcc3dffbc6b7a6f12833821793f8e9fc37124
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 10432 bytes
SHA-256: fc567efd79381b2da33c9f28c09928fbf51de2e58e1cb05f06a14c4a5ea113f8

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