Malicious PDF — malware analysis report

Static analysis result for SHA-256 104783025302b390…

MALICIOUS

PDF

88.7 KB Created: 2020-12-30 14:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c5bc305df840268789528990b269e8ae SHA-1: 3703a6d2c16da225085b7b49a431bde7ea82eca2 SHA-256: 104783025302b390cd86fb4b50d15ae308203b0a0d23bc32a3a2bf2c8060e7eb
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, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_LINK_FARM' indicates a high volume of external links, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The embedded URLs likely lead to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://traffset.ru/123?utm_term=verbes+pronominaux+exercices+fle+pdf PDF link annotation
    • https://nuzolegan.weebly.com/uploads/1/3/4/5/134576582/d7a0c17839e8f76.pdfIn PDF document text
    • https://bonifivudinuf.weebly.com/uploads/1/3/4/3/134305406/3848541.pdfIn PDF document text
    • https://jodotabamusunew.weebly.com/uploads/1/3/4/4/134402052/1920592.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/bagaforop_menif_tofafa_gevokidiz.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/rapexasaramo.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
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/a391fee2-5023-4629-b529-e52c7cde6328/35423841144.pdfIn PDF document text
    • https://s3.amazonaws.com/rurovikejigibu/40661719270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4b2b14d-fce7-449c-bc0b-d60b1d221eca/10086858132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b0d8a2-a9e1-45eb-8871-33b951356d0a/sewuduvobixod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bca28b2-8e01-4186-ac55-b16875c0b227/fazonefawi.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/ccna_cisco_certified_network_associate_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/aasld_guidelines_for_sbp_prophylaxis.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 5276 bytes
SHA-256: 32d14e30204cd4fe6470039714e645a95f65a27334d447b55d0fa0cdf1b0f461
font_01_sfnt_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 12812 bytes
SHA-256: 6eb90ae1cb7cf9e9744997f1c85065138fb44de5c1e16dfbdf0a698544448c92
font_02_sfnt_off00012768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12768 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_03_sfnt_off00013568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13568 9420 bytes
SHA-256: 16d97858a696c66d7857028d9d44502e30acc32ad20a1e5c54ed3d1eaafd800a

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