Malicious PDF — malware analysis report

Static analysis result for SHA-256 586e36d585763dc5…

MALICIOUS

PDF

72.7 KB Created: 2021-02-19 12:23:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 92d03f259ae2aaf039ebf92b0cbb0d0d SHA-1: 430019ee5d42b94062980fd3c9a96beaf0730e71 SHA-256: 586e36d585763dc5bd8f0bd30743f75a99660e2b5cf3b7b39a41e2f545494050
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as tutorial downloads, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to harmful sites.

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://crophysi.ru/strik?utm_term=basic+electronics+video+tutorial+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387706/normal_5fdc3bc179d35.pdfIn PDF document text
    • http://pitushok.space/infusion_enchanting_research0ccl5.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/fSDBkSm/first_aid_kit_america_album.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_6024a95f2b400.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/pidjaih/65555566372.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/MMzgfjc/slither._io_skin_codes_2019.pdfIn PDF document text
    • http://vorecan.fun/solving_equations_story_problems_worksheets38f50.pdfIn PDF document text
    • http://priz24.site/98823680232h5gdz.pdfIn PDF document text
    • https://cdn.sqhk.co/nububufi/ggEjeie/loner_quotes_images.pdfIn PDF document text
    • https://jiwuzutobaduf.weebly.com/uploads/1/3/4/8/134889186/lajunuwuduwufe_sajazeg_jepozod.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/kexamoxusinixu/66187631259.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/kotalajekolo.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/fishbone_templates_powerpoint_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/gameboy_color_emulator_android.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/mivili.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/install_arch_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/what_does_carfax_functional_damage_reported_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/42690654061.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/photoshop_brushes_watercolor.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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 5136 bytes
SHA-256: 9a3fa42ceb03b792c3b56590a547f70c01861e70209846cdbbe64745c02fc33d
font_01_sfnt_off0000f192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF192 10608 bytes
SHA-256: f8394a0fecf5925d08a9be344011251cc8a3c8d2040aa530c4db1f0536d15be1

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