Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0ad91cf2019b5f…

MALICIOUS

PDF

83.3 KB Created: 2021-02-24 14:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: da180eb6af6d536abcff88b670fa76e6 SHA-1: 2b96f59b341e382a65aaffb35d69d9eca88012e9 SHA-256: dc0ad91cf2019b5f2cbbd937eea7623dad65bce83578d76cf35277db67733fa8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO abuse tactic. The embedded URL and the document body, despite being heavily obfuscated, point towards a lure related to 'synonyms word list 4th grade'. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or redirection attempt.

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://crophysi.ru/award?keyword=synonyms+word+list+4th+grade PDF link annotation
    • https://cdn.sqhk.co/ligumorik/n90hdic/59636884706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418566/normal_5fd65273d8ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_6022b3bb24fa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_60328f5f79eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_5fe99eef3a5cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5fc88af876ecc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367919/normal_5fdf941ec2ca4.pdfIn PDF document text
    • https://repotadidutu.weebly.com/uploads/1/3/4/3/134310826/f0d83fd6550.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/sumesawoxajew/facebook_app_for_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/adhyaksha_in_america_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/blog_design_templates_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/puxizabovevaboki.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/what_is_dd_on_drivers_license.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/formal_letter_format_cbse_12.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/best_excel_finance_templates.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_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 5412 bytes
SHA-256: 2bd824e99218df3e70aad49bb165d357b0770cb22b498702dbcc5e67c5e60ef2
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 9924 bytes
SHA-256: 474fa9f850636251b21468b525034d5b4ea337edb4b44f3875eb22c301c57ee7
font_02_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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