Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce331fd87abc7e72…

MALICIOUS

PDF

80.9 KB Created: 2020-11-14 06:39:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 142df40ca60ed85e98630f8d4c1c0857 SHA-1: d5809138ce91e904b9bd98a1364a8616ac648994 SHA-256: ce331fd87abc7e72d86f2d596927dba2fedc94692e0c79eb8eec23c84785c156
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded URLs, with one identified as a known malicious redirector. The document body is heavily obfuscated, but the presence of a link farm suggests an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=android+linux+stable+github
    • https://fafugugopogewip.weebly.com/uploads/1/3/4/4/134464831/5487755.pdf
    • https://cdn-cms.f-static.net/uploads/4366664/normal_5f8a1d8365e43.pdf
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/40a5e5.pdf
    • https://jewojumafolu.weebly.com/uploads/1/3/4/6/134651010/bf97bacf0d98f.pdf
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f895dc004c82.pdf
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5fad57386d631.pdf
    • https://cdn-cms.f-static.net/uploads/4423442/normal_5faa08f2a079e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/begijufadi/19737081137.pdf
    • https://s3.amazonaws.com/mijedusovineti/capsulitis_adhesiva_fisiopatologia.pdf
    • https://s3.amazonaws.com/rekorewexidiwo/latex_preamble_example.pdf
    • https://uploads.strikinglycdn.com/files/4dd607d2-a0d3-449f-b293-3367bc0a8f39/84368255265.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8b.bin
2e0ee37cd64f4c35472631c058407906ad20f0781d2500579fe3f45af03c2431		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 6812 bytes
font_01_sfnt_off0000fec2.bin
dad2f39568813e35388fd642b5ccd2d86a32e24e0a0e1f6d829d01db4d5271b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 5284 bytes
font_02_sfnt_off000110b1.bin
39fb7257b8dce7452aa5efa24a5db44bc38e6dccd0bc8e3352f8e6d2ae2b1c37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 11244 bytes

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