Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56cbc3652a9e580…

MALICIOUS

PDF

67.3 KB Created: 2020-11-24 14:18:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 928baf47f4a31dd2c3a08043a5e2feef SHA-1: 95545b4939596dcb384b1913d83a7ead73cdfd5f SHA-256: a56cbc3652a9e580cc211b4ca24ae427c3754adce4bd601bc5fd31e1ef706517
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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/strik?utm_term=econometric+analysis+of+cross+section+and+panel+data+citation In PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_5fb9af83d53c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419194/normal_5f969cf3e4534.pdfIn PDF document text
    • https://paboludozov.weebly.com/uploads/1/3/4/3/134333588/c86e1496e6f37b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454425/normal_5fa383ccb2f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453528/normal_5fa79a49d72ef.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/5fe73513-afd5-4e27-b260-5fea955b7b84/79904311617.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/rakazorupaposusev.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/ratupifanoperorufek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b15bc466-d765-49b3-9d5a-9aad6abf012d/lezukodolinenel.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/free_powerpoint_2007.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_off0000c9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F2 5360 bytes
SHA-256: a1803440ff336d302923e891ae772937735702db0fd3443a16b26b60bbfcb8ac
font_01_sfnt_off0000dc24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC24 10584 bytes
SHA-256: fa575e82ac42a66c59b615d7a3769039fbbfd7517b5bacaef43f363130263ec3

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