Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e38ea721eb8636…

MALICIOUS

PDF

76.4 KB Created: 2021-03-02 12:17:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5862ee62f0ea38bdfd8bb24dae29c018 SHA-1: 1f36b143c829b0cf83b2f440df1e144334812a9e SHA-256: 77e38ea721eb8636406e6ba6dad705dd57173cb9126d043f390aac93f971bcd7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of ML and ClamAV detections, along with the PDF_SEO_LINK_FARM heuristic, strongly suggests malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://resalured.ru/strik?utm_term=zebra+gk420t+label+software+download PDF link annotation
    • https://xoxovumalojiru.weebly.com/uploads/1/3/0/8/130874224/jakuvuxegawufa.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/e764aa897c95.pdfIn PDF document text
    • http://bbflowers.net/barbie_movies_in_tamil_free_tamilroxh0k5.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/3uqifgf/checklist_manifesto_chapter_summary.pdfIn PDF document text
    • http://xifotole.iblogger.org/free_christian_t-_shirt_design_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/businaxidare/iejcR1l/63689731713.pdfIn PDF document text
    • http://reduslimitaly.website/9979653048i4zgi.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/dhbajgz/wobixed.pdfIn PDF document text
    • https://wabebapag.weebly.com/uploads/1/3/4/3/134335427/8813a.pdfIn PDF document text
    • http://egosikenclub.com/definite_articles_spanish_worksheetmju4c.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/SUcgf9q/best_weather_apps_for_android_phones.pdfIn PDF document text
    • https://tewabigonin.weebly.com/uploads/1/3/4/7/134760563/5bd71da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tugupora.epizy.com/chapter_2_linear_equations_and_inequalities_answers.pdfIn PDF document text
    • http://netuvorib.epizy.com/93594041717.pdfIn PDF document text
    • http://kenuxiximusopev.epizy.com/volume_booster_goodev_apk_full.pdfIn PDF document text
    • http://wakagita.rf.gd/44084067660.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_off0000eb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2A 5688 bytes
SHA-256: 2029b7dddbefba989c6f7f0e41ea321837595359d8afc8056d4e39a406f454c6
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 11052 bytes
SHA-256: 09476c27aa111d668df0a15dc8466937f55b1fc61e8442c0fd9a32da49805212

Open this report in the interactive analyzer, or submit your own file for analysis.