Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a3df4ad0a5c676…

MALICIOUS

PDF

72.5 KB Created: 2021-03-19 18:05:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b1846e65982ea98c4493f091e14395db SHA-1: 56dcef91ac8f52ad5c522628bf83bdab3313dedb SHA-256: 48a3df4ad0a5c676a855eb7d1eab1b0eec301ea3381606e194084c4083e1ea2a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=metric+conversion+worksheet+answers+physical+science PDF link annotation
    • http://bujenaro.scienceontheweb.net/anova_one_way_and_two_way.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485153/normal_5ffcffc3a595a.pdfIn PDF document text
    • http://bobixina.getenjoyment.net/91276268266.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/6df07ee6bbf.pdfIn PDF document text
    • https://zedetebi.weebly.com/uploads/1/3/1/0/131070456/7734990.pdfIn PDF document text
    • http://rusadezebep.mygamesonline.org/little_girl_1st_birthday_poems.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446925/normal_5fcce6b600c85.pdfIn PDF document text
    • https://nemapawa.weebly.com/uploads/1/3/0/9/130969411/102dca91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450257/normal_6038134b075a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408330/normal_5fe56aebef3fb.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/LWidjbM/revelikitelunarosubajedom.pdfIn PDF document text
    • https://resawipodejevi.weebly.com/uploads/1/3/0/8/130814711/6523178.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woxikajir.myartsonline.com/charades_en_francais.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/compton_s_most_wanted_late_night_hype.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/24826418145.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/kepoluvejiregowowawa.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/vocabulary_workshop_level_f_unit_2_answers_synonyms.pdfIn PDF document text
    • http://sawurawefivovo.myartsonline.com/business_english_advanced.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_off0000dd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 5344 bytes
SHA-256: 8a7a66f1bb52383062d62a933f191828c58287f1440fee6181fe549faeeaf572
font_01_sfnt_off0000efb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 10824 bytes
SHA-256: 259b30a2f799108ccb028c13bd790c43525c1ff0d2f479380f8e313f6e1028ab