Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9c82f2834847da2…

MALICIOUS

PDF

74.7 KB Created: 2021-05-21 06:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1392746f55d15139fc6938acd120805f SHA-1: 27fd45b2c380af1590cd4c6293a64dc27aa204d3 SHA-256: b9c82f2834847da20dc327df855bb8e64b4d14d5c2c2e784aa1235e89a2282e8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of external PDF links. One of the primary URLs points to a domain associated with potentially malicious activity. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect users to malicious sites, aligning with phishing or SEO spam tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=how+to+solve+two+step+inequality+word+problems PDF link annotation
    • https://tisuzozolida.weebly.com/uploads/1/3/6/0/136087901/b8270d618f3.pdfIn PDF document text
    • https://gidupewurugi.weebly.com/uploads/1/3/1/6/131637306/9202306.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/4732516.pdfIn PDF document text
    • https://terifebi.weebly.com/uploads/1/3/2/8/132815785/8d35da7f1b2c6b.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/a7c44699b6dec8a.pdfIn PDF document text
    • https://rawebitor.weebly.com/uploads/1/3/4/3/134337567/febativolefupolaxa.pdfIn PDF document text
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/vexotibarojedilobi.pdfIn PDF document text
    • https://ronawidafaleso.weebly.com/uploads/1/3/4/5/134504313/2698977.pdfIn PDF document text
    • https://runobutadafe.weebly.com/uploads/1/3/0/9/130969205/4740165.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/dopugaxelelema/tifesivira.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/which_of_the_following_assets_are_amortized_check_all_that_apply.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/73982615106.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/how_many_calories_in_wendys_breakfast.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/walevulotasixum.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/hyperuricemia_and_gout_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/2001_maniacs_movie_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/research_poster_template_powerpoint_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/awas_yojana_2019_online_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/chromeleon_report_designer_manual.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_off0000e44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44E 5588 bytes
SHA-256: 4f8eb5f2598d2ec1539df754d8f3fc52165655f19a2b2bc2d5a7316a5fa5ad4c
font_01_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 11196 bytes
SHA-256: 176f0baa8aa0b2f1dcb03cdb9f9cc018bda4db41fd0be05023f13be85834866c

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