Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ee3c28e120deb91…

MALICIOUS

PDF

79.9 KB Created: 2021-02-13 00:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4a551353214fee330a8949eb4cec0773 SHA-1: b5b0d87b378b0188f2d14fc08720302bd80233cd SHA-256: 8ee3c28e120deb91857e473e00e17d23d1292dd3d55366c49fb828ae2ff9eb77
214 Risk Score

Malware Insights

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

The PDF contains a link disguised as directions for a medical device, which redirects to a known malicious URL. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate this is part of a phishing or link-farming operation. The ML classifier and ClamAV detection strongly support its malicious nature.

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
  • 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 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.
  • 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://yafferge.ru/123?utm_term=cvs+wrist+blood+pressure+monitor+directions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4494435/normal_600fb26b6aa8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384308/normal_602146f30c31a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372382/normal_5fdb5c96b13c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383806/normal_60011ff19c6c6.pdfIn PDF document text
    • https://sukuwakutas.weebly.com/uploads/1/3/4/6/134603616/8304febbab95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_5fc853ef26810.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/36f4c4d2.pdfIn PDF document text
    • https://zapamapat.weebly.com/uploads/1/3/0/7/130775391/2e5e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fd38550cc16c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_6011463bb4d27.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://s3.amazonaws.com/wenobagupexekap/41243027004.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/java_7._79_filehippo.pdfIn PDF document text
    • http://nuxebezojav.epizy.com/piriformis_muscle_spasm_causes.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/ncert_class_11_physics_textbook_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/graphing_inequalities_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/transformer_autobot_drift_and_jetstorm.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/kokigawuduk.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_off0000ed71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 5204 bytes
SHA-256: 3edd20ce4f93193f60f05ede7c9197c8cfe57cc2ab0f249706f074a75575791b
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 10816 bytes
SHA-256: 4bfecc32c75f87da6f40cdd8cd451a504ccfa125d8ec5aa9e96443bb2c7e8542
font_02_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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