Malicious PDF — malware analysis report

Static analysis result for SHA-256 1618f9fd8fb4de97…

MALICIOUS

PDF

142.9 KB Created: 2020-11-14 00:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 38e67ed309f54e41c652eb06313e9716 SHA-1: b4affab5a70eb1761a39c24b81785b9adc2b686a SHA-256: 1618f9fd8fb4de97f308e8c78df65dba21256c589930fee633b9a4054804fdba
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 0.9984

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/123?utm_term=r+bar+los+angeles In PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/letugufogukebu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_5f986ab0d3b85.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/65e2bd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416790/normal_5f9667725c234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367301/normal_5f929d7398304.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/5c1e9c6ee381024.pdfIn PDF document text
    • https://gugewixurot.weebly.com/uploads/1/3/4/3/134393699/pabunoneteseni_pumukef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fab6070832da.pdfIn PDF document text
    • https://tudasuli.weebly.com/uploads/1/3/4/4/134403402/kigupavirasage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_5fabfba8483e5.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/vinivuxo/vimove.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D720 4472 bytes
SHA-256: fa1cf34eca562aaaf3af90cd6c956d343d49e78b323157fdf1119847079cf0d8
font_01_sfnt_off0001e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E71B 5000 bytes
SHA-256: 4a47798306b0e7f8d3668753216db7b4a7ddc8c859ee9e95cea4010238b495ab
font_02_sfnt_off0001f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F830 17468 bytes
SHA-256: 270fb874ebafefc789eff2edb222c286574cf8c0dbff71de96e774bc97ffb271

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