Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f6cd17e712ffe5…

MALICIOUS

PDF

68.8 KB Created: 2021-02-18 01:52:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e459903f2127d9b2db9cf34901ebff48 SHA-1: 17b6abb50829dba81f878d06bfeb0f61b326cd41 SHA-256: 78f6cd17e712ffe538b9d391d1895c9cc6fccc8b5b433c86e6e71ec9821a8096
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the presence of numerous external URLs points towards a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

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://jottigo.ru/wix?keyword=code.+org+answers PDF link annotation
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/91e88e6b.pdfIn PDF document text
    • http://bestplacefor.rest/77354070921wpj3r.pdfIn PDF document text
    • http://agreevudb.rest/android_tv_remote_control_app_githubswtyq.pdfIn PDF document text
    • http://stakingyfi.com/66539434470iczbw.pdfIn PDF document text
    • http://forexgeeks.net/kosig8do1a.pdfIn PDF document text
    • http://front-glass.website/letojexavawanugevebobi3i65i.pdfIn PDF document text
    • http://custits.space/84162147341ge63i.pdfIn PDF document text
    • https://fojefutitamok.weebly.com/uploads/1/3/3/9/133989463/8490748.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/hchihbx/vifudi.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/rovikibixu/82396911976.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/aankhen_full_movie_worldfree4u.pdfIn PDF document text
    • https://s3.amazonaws.com/xixonu/free_fancy_border_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/farefasejikap/film_autopsy_of_jane_doe_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/colloquial_arabic_levantine.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_off0000d13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13C 4992 bytes
SHA-256: 7d32cd1490d992fab596ee68d093fd67d386d8184eaae87683fe6579ece8526f
font_01_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 10836 bytes
SHA-256: 8714e189778f29d7aff445c10ffc1d76b1c35111f486a5594df5083ade94ae75

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