Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce83dbc226b9f24…

MALICIOUS

PDF

69.7 KB Created: 2020-11-17 06:50:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54ff59b9da9ecb9089265ce2c11569bf SHA-1: 1dc9a202271983e11a99d78d33f06577b949e81f SHA-256: 4ce83dbc226b9f2471bee1f6bf62b07ad0afe1249dd37c3f39c5c039b038eb12
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to known malicious redirectors or link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, suggests a lure related to 'Nespresso lattissima descaling instructions'. The presence of multiple external links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=nespresso+lattissima+descaling+instructions+pdf
    • https://wejibuxod.weebly.com/uploads/1/3/0/7/130740202/niwikafudag.pdf
    • https://zabugusu.weebly.com/uploads/1/3/4/3/134311035/97e7deb2459c725.pdf
    • https://cdn-cms.f-static.net/uploads/4420775/normal_5f9927772ac37.pdf
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/vimimijidife.pdf
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/muripet_fizuvikerageb.pdf
    • https://cdn-cms.f-static.net/uploads/4425759/normal_5f97531cb3778.pdf
    • https://gilolubirej.weebly.com/uploads/1/3/4/3/134309297/4ba14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/35877e35-96a0-4ce8-bad6-a2ada073d9e2/mind_gym_book_report.pdf
    • https://s3.amazonaws.com/gozilum/argon_html_template.pdf
    • https://uploads.strikinglycdn.com/files/8f36c619-caed-4f3e-8988-3dee75b97a49/letter_tracing_worksheets_australia.pdf
    • https://s3.amazonaws.com/jamokaroxoj/92087158478.pdf
    • https://uploads.strikinglycdn.com/files/6c8c00eb-252c-456c-b94a-f305bde71c3f/jugiwukarikevuwikukezu.pdf
    • https://s3.amazonaws.com/tifuwuw/manual_de_borland_c_5._02.pdf
    • https://s3.amazonaws.com/takeju/video_editor_website.pdf
    • https://s3.amazonaws.com/kosamupim/69809938068.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c893.bin
da09ad3a0563b2c220965e91ddd382bc9e566291581fcf8f8b540249983bc2ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 5324 bytes
font_01_sfnt_off0000da98.bin
6d0c8cccbf56f9d9bdf8378530e4b37bdb0f2b3c6ecc9021bdc4ad77294b7e9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA98 9524 bytes
font_02_sfnt_off0000fb0c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0C 4324 bytes

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