Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3fd81c9d41c2dd4…

MALICIOUS

PDF

75.1 KB Created: 2020-12-23 16:44:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8eb85eca5a18a279e35cba00023b0f1 SHA-1: b20ee7f9dba4be9a9f0524a8555df4db55d024de SHA-256: b3fd81c9d41c2dd47b6b4e000444b75c4fc663c916358744d8f36de8281670c2
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 PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS, indicating malicious intent. The embedded URL points to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains references that align with phishing lures.

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://traffmen.ru/aws?utm_term=charlie+malayalam+movie++in+kickass
    • https://punebadajunejed.weebly.com/uploads/1/3/4/5/134597598/fudelunotaj_dixatibufarimu.pdf
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/e3ac99.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ebc22d08-fd22-4d55-8d53-097dfccc6d72/flash_super_mario_bros_unblocked.pdf
    • https://s3.amazonaws.com/wipotegadodorek/mibivodawavijakol.pdf
    • https://s3.amazonaws.com/nigimul/case_study_format_business.pdf
    • https://uploads.strikinglycdn.com/files/a6fbf090-643d-4a2c-a552-a1dc2ef12f94/cen-tech_infrared_thermometer_calibration.pdf
    • https://s3.amazonaws.com/sepawi/49782203934.pdf
    • https://uploads.strikinglycdn.com/files/d834e652-a646-4f8b-bf4f-8221ed0da836/sezifulafuvazovokamaxij.pdf
    • https://uploads.strikinglycdn.com/files/1359c560-8882-4b94-a65b-642438e79b87/11481637666.pdf
    • https://uploads.strikinglycdn.com/files/33213f34-a157-432f-b94a-324a3b935854/22551019083.pdf
    • https://uploads.strikinglycdn.com/files/110a3268-3707-4dc9-8435-45607b0ed5b7/amateur_family_porn.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4db.bin
051c7cc3e8ed502f8b334303354485e2ad788fb4fade88b5d29b46ddee9851a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DB 5168 bytes
font_01_sfnt_off0000e64a.bin
349da36ba318c259367544b9aeb067a168d2e86844638cf304943bf5f43b3c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE64A 10740 bytes
font_02_sfnt_off00010b15.bin
13adf508137d8c465935a7a142060f5d940462760dc3fd3f5061e956d2f2222b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B15 16028 bytes

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