Malicious PDF — malware analysis report

Static analysis result for SHA-256 1828f08b9c5b1f85…

MALICIOUS

PDF

87.4 KB Created: 2021-02-03 06:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1db62a3a6d2e525124bf7607789395f9 SHA-1: d861ea9456f1783e096607d685e56581124ef4fa SHA-256: 1828f08b9c5b1f85a30a3a096fde203dffa8538e460c4176d6ac21c6d11f190d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting an SEO link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or spam campaign designed to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=maintaining+homeostasis+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc98bfcc95e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460708/normal_5fe0bca36b3d0.pdfIn PDF document text
    • https://pinejose.weebly.com/uploads/1/3/4/4/134467182/talolep_xefetevakijopa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413570/normal_5fda8e84bc807.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/mastering_javaserver_faces_2._26touz.pdfIn PDF document text
    • http://xapozibun.22web.org/cooling_tower_capacity_calculation.pdfIn PDF document text
    • https://nozifudofo.weebly.com/uploads/1/3/2/6/132681081/115734.pdfIn PDF document text
    • http://yozi.store/gunijaxuvexuzegow3py1r.pdfIn PDF document text
    • http://fb-pageunderreview.com/outdoor_cat_condo_canada9ejar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453908/normal_5ff1d02923bb7.pdfIn PDF document text
    • http://mpvideo.org/fast_racing_league_dolphinn73s1.pdfIn PDF document text
    • https://taretowixulu.weebly.com/uploads/1/3/1/0/131070971/8b11d.pdfIn PDF document text
    • https://vawevoza.weebly.com/uploads/1/3/1/4/131482963/8144671.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/jiguwuzobozobaz/dulofibanoze.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/37075878682.pdfIn PDF document text
    • http://fopebuzab.epizy.com/charlie_malayalam_movie_dubbed_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/narifinafatamizobibir.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/75151700280.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/energy_transformation_worksheet_6th_grade_answer_key.pdfIn PDF document text
    • http://juzavogubi.rf.gd/celtics_score_sheet.pdfIn PDF document text
    • http://degefoxovovi.epizy.com/falolebebilodivomuvururu.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_off00011bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF0 5228 bytes
SHA-256: 3dc7447b449f5169f9778cc9cc4905c11678170e4ad1a8e856b0d76dbe5be6b7
font_01_sfnt_off00012dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAB 10052 bytes
SHA-256: 090bd55ed488edff87a1a8b622a5f6a8a7993ba4ba0d89af30385a540407f77a

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