Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b0cade5eb95104…

MALICIOUS

PDF

74.5 KB Created: 2021-01-23 19:16:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: dd667e4e6f579a6540a99ea03314a905 SHA-1: 52e947ae22de0560e397be825088d09e08df551f SHA-256: 82b0cade5eb951040fbd9df09a601a5e156ff2349add38c9f5c4dc3f7ebc4783
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector pointing to 'https://yafferge.ru/aws?utm_term=alexandria+virginia+police+reports'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=alexandria+virginia+police+reports In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454161/normal_5fdf080e92778.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490364/normal_60014fdcbcacf.pdfIn PDF document text
    • https://direwuberegenis.weebly.com/uploads/1/3/4/3/134361890/zaluz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377098/normal_5feed44751a9c.pdfIn PDF document text
    • https://xudomulur.weebly.com/uploads/1/3/4/0/134040538/kelafa.pdfIn PDF document text
    • https://pakimisubimoge.weebly.com/uploads/1/3/0/7/130776027/pitotipadebod.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/8679713.pdfIn PDF document text
    • https://bodarisijusafu.weebly.com/uploads/1/3/5/3/135383154/8da55867.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/nokiva/glaucoma_treatment_guidelines_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/danelapanovubowamesutupa.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/baixar_snaptube_para_celular_android.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/free_flyer_design_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/bible_commentary_app.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/48982940205.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/celebrating_success_and_failure.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/kesoxeteferijasunoseb.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/asus_rog_gladius_armoury.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/osrs_falador_diary_easy_guide.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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 5360 bytes
SHA-256: 14a860234e7dcf5a04c16c94bc11fb63dc5a375fcb947dd0fe126af38bc9d9df
font_01_sfnt_off0000f6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FB 11152 bytes
SHA-256: 4e52686729fe1f91a2b252c318ad8bd6de4b18a8a06b8e2caa9ebb8bcda64307

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