Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc38ecadb7dcf9ea…

MALICIOUS

PDF

81.2 KB Created: 2021-01-21 13:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9c531f3c0bebe796149f5763b11ff438 SHA-1: e3f98d2348483af72c1aee0e739fc57d6a79a5b0 SHA-256: dc38ecadb7dcf9ea62beb1b5daac37d4fcd25acdec07b618c1823a7f0a6b2364
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or used for SEO manipulation to drive traffic to malicious sites. The embedded URLs, such as 'https://trafffi.ru/aws?utm_term=platform+espadrille+sandals+rose+gold', are likely used to redirect users to phishing pages or download further malware. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

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/aws?utm_term=platform+espadrille+sandals+rose+gold PDF link annotation
    • https://site-1178570.mozfiles.com/files/1178570/3293736470.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/fjfcWrh/90880150319.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/hChcggf/surixomezod.pdfIn PDF document text
    • https://bopidojosonek.weebly.com/uploads/1/3/1/3/131384153/vilusibanivoke-rikadagov-zizuroxiloxivip-govefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486213/normal_5ff3e00517dd3.pdfIn PDF document text
    • https://site-1178690.mozfiles.com/files/1178690/98138892906.pdfIn PDF document text
    • https://xamukujivova.weebly.com/uploads/1/3/1/3/131384573/varem_repow_ropozorapofo.pdfIn PDF document text
    • https://site-1177476.mozfiles.com/files/1177476/transformers_autobot_hound_premier_edition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481052/normal_5ff854bcaf081.pdfIn PDF document text
    • https://tejojapifofomo.weebly.com/uploads/1/3/4/3/134339563/9645555.pdfIn PDF document text
    • https://junurewumopu.weebly.com/uploads/1/3/2/7/132740614/8483186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370059/normal_5ffb3ef8e845d.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/tawovojo/graphics_file_formats_definition_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/fasomusogapovi/47606728420.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/93095741656.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/lefowunilejegutujolipafi.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/lakevowefaxalib.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 6588 bytes
SHA-256: fa72874b8c381873b432d3b5cea9ecddba20f04e8e1c9face7d560df1136061a
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 5360 bytes
SHA-256: 32e375b63c148f48b8ebb7d190f1a5c6705d5952757a52a10b4401c65d4292ce
font_02_sfnt_off000110c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C7 11584 bytes
SHA-256: 3ba1b75b8e4745c2e16f6c236486df5ab5dc47cd43e381d9d88c24a78b8c4e40

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