Malicious PDF — malware analysis report

Static analysis result for SHA-256 547a49072f175e10…

MALICIOUS

PDF

79.5 KB Created: 2020-12-03 16:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0bd01cd28268668da53aea64cec2aceb SHA-1: 9b931db3f5378715fba330115e52beb33c332e6c SHA-256: 547a49072f175e106b9f46dcd589b06e6ee82213063b6ea6797c0ce0edfa74e8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting a link farm or phishing attempt, with one prominent URL being 'https://trafftec.ru/strik?utm_term=fortnite+building+simulator+games'. The document body, though heavily obfuscated, contains keywords related to games, likely as a lure. No scripts were extracted, but the PDF structure itself is being leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=fortnite+building+simulator+games PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410694/normal_5fa3eeb60a451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f9e369b39211.pdfIn PDF document text
    • https://guxelopadak.weebly.com/uploads/1/3/4/7/134727887/pufuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475728/normal_5fb4e430c395e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fbd8b9039863.pdfIn PDF document text
    • https://zuwukozoxuwiged.weebly.com/uploads/1/3/4/7/134713444/d4a821cca56ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5faf7bd8d14b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8a86de05039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a29c74-3659-4cd5-a86b-82855652bafd/famanatapozuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ebe37f5-df0f-45ba-b2a9-7781fe9a69b0/83570623935.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37966401-19ac-402a-9a5e-8f747897bc6b/xaxiteguritafewukobatu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac6c6747-2567-4e79-919a-0740cb48ccd8/read_receipt_yahoo_free.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc32e547848ba205d276709/t/5fc860d6217b3604eddaaed6/1606967511033/last_minute_deals_hotels_las_vegas.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_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 5240 bytes
SHA-256: 46ebcc294db43766bcba1487e791c6810df6b172388e7dbe78f4c34dc18edd83
font_01_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 10560 bytes
SHA-256: a79a75421fd78d8e9fdbba473d1af395e9a2370ce8740ee79922f23e00aeb309

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