Malicious PDF — malware analysis report

Static analysis result for SHA-256 410130e4d276e0ef…

MALICIOUS

PDF

67.0 KB Created: 2020-11-17 07:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 083a966a54681d3ffe29c30b82ca07aa SHA-1: 1d1911f156852e9a4c8b37c20ee34640ff45455a SHA-256: 410130e4d276e0ef483e96c31ea67a57ecd7d8d4c8b3935903c7aec903f9cbec
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to other PDFs, indicative of a link farm designed for SEO manipulation. The primary malicious URL identified is 'https://trafffi.ru/123?utm_term=verbs+that+start+with+letter+c', which is likely used to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=verbs+that+start+with+letter+c PDF link annotation
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/5463cfdf2c6b85f.pdfIn PDF document text
    • https://misaxokur.weebly.com/uploads/1/3/4/3/134354007/b2452b5412b0ef.pdfIn PDF document text
    • https://palokeligiz.weebly.com/uploads/1/3/4/4/134496709/wukoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471106/normal_5fa4c5d020d15.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/pazerogasarinu/4714946884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce47e4f1-3959-43d7-8aad-cf5d589cd595/ver_dr_house_online.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/nibasifenejofori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79238d3f-0b66-42aa-a7ed-885f86527706/miller_syncrowave_250_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd71059d-a376-4335-9968-c385c4f785e0/72042962394.pdfIn PDF document text
    • https://s3.amazonaws.com/fusidejebi/60532052803.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/dojawaxemitofolubasobada.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_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 5084 bytes
SHA-256: 293e1eb865f92ae60d9619af6363058de127998fc1a334beab281621d67675ce
font_01_sfnt_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 10544 bytes
SHA-256: f33aad03ce9d4d2fe59b55bbe52915393002d1fbe211d0ed11553ea72c065b40

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