Malicious PDF — malware analysis report

Static analysis result for SHA-256 494e88e5b5d67259…

MALICIOUS

PDF

69.2 KB Created: 2020-11-24 05:15:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 015bed5576f0e4ca6e53eea36e152655 SHA-1: ae336d697106fdb8732626dbd158a2f63c775aa3 SHA-256: 494e88e5b5d6725929b3758943cf1712fe13c6d643e06dbf6e792cbc12b8e373
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector URL, indicating a phishing or malware distribution attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the presence of a link farm suggest the primary goal is to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to trick users into downloading further payloads or submitting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/123?utm_term=hierba+mala+nunca+muere+cancion In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368479/normal_5f91d3c88dd78.pdfIn PDF document text
    • https://jotujovogubiraf.weebly.com/uploads/1/3/4/6/134627891/juratenokuxa-nejuminudotore.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/tuleburufol_wefutedox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403404/normal_5f96f3a9b2fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fab09840ef4d.pdfIn PDF document text
    • https://vosasavowaje.weebly.com/uploads/1/3/4/5/134587316/kigozoxudiduz_jirejezuresoxa_mesesoxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450634/normal_5fb8bc8b24e63.pdfIn PDF document text
    • https://voziguwotameba.weebly.com/uploads/1/3/4/3/134345279/visokumevu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_5fb36f216a37c.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/fulosobezur/friendly_letter_template_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ddcf434-23e0-4da7-a66c-9a339aa0d031/kejukotaze.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/rate_of_decomposition_of_calcium_carbonate_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1697ebad-0f4d-4873-9a81-54c3ce8f7b82/bosch_300_dryer_manual.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_off0000d193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD193 4868 bytes
SHA-256: 5f3f2e8c554f819614104b74e93436f985903f9d690611514424ab00645a4230
font_01_sfnt_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 11256 bytes
SHA-256: ca804d9531df72fa8e03b5e8725adbcd4ae2c34d8df58ea74f59e0eef1864287

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