Malicious PDF — malware analysis report

Static analysis result for SHA-256 6973ae2703cc7ffe…

MALICIOUS

PDF

75.8 KB Created: 2021-02-19 20:51:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 54d5870fed448ae43908245aaaa8df32 SHA-1: aff7cb6bdaba0e5b859ebe415042de6058144c18 SHA-256: 6973ae2703cc7ffef333b815d72d450be1a0c16bd8721b95e918d1a189f695ca
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 pointing to Weebly and S3-bucket hosted PDFs, indicative of a link farm or SEO spam operation. The primary URL, 'https://baarspo.ru/strik?utm_term=enfermedades+mas+frecuentes+en+el+sistema+endocrino', suggests a lure related to endocrine system diseases to attract traffic. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content.

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 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://baarspo.ru/strik?utm_term=enfermedades+mas+frecuentes+en+el+sistema+endocrino PDF link annotation
    • https://javubabajekav.weebly.com/uploads/1/3/5/9/135957287/nijane.pdfIn PDF document text
    • https://bodizolisasutez.weebly.com/uploads/1/3/1/8/131871954/271199.pdfIn PDF document text
    • http://znohist.site/acrylic_sheet_for_laser_cutterf985h.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/dc4fdFM/dugawu.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/jix2hfU/kerulorinoj.pdfIn PDF document text
    • http://flathead.us/what_is_financial_autonomy9r2l5.pdfIn PDF document text
    • https://cdn.sqhk.co/madilaxetevo/az5B2jN/fine_line_coloring_pages_harry_styles.pdfIn PDF document text
    • https://cdn.sqhk.co/wugoxoxowex/dZyUjjL/15746419529.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/wutisigila/kiporoxo.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/occupational_health_program.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/zilizijibonisud.pdfIn PDF document text
    • https://s3.amazonaws.com/kovibu/bootstrap_3_responsive_admin_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/crash_course_us_government_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/wunibiguxumo.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/english_speaking_practice_conversation.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/47214093106.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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 5004 bytes
SHA-256: b7af9a4b1f8e47aed094408a47dbc522f45cedf9d272ce3fb0395236aafa6cc1
font_01_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 11032 bytes
SHA-256: 1f13f40e373373d32d3369bd2f129296873ba4d64615d2d07ae8a65b5d310d3c
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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