Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd87304082e1d7aa…

MALICIOUS

PDF

61.2 KB Created: 2020-11-28 17:18:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: f834af22a0af39d81fb4127027ac9b13 SHA-1: dc687bb09e4a1a9fa182669539d97925d1b33a0a SHA-256: cd87304082e1d7aa4912f83aa5de3017c15860cbdfa8da36cf3f5d050caa0b20
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffking.ru/strik?utm_term=ju+ju+bees+diaper+bags PDF link annotation
    • https://xigufolasifu.weebly.com/uploads/1/3/4/3/134352497/309479.pdfIn PDF document text
    • https://petarukezatu.weebly.com/uploads/1/3/3/9/133997491/43bf9d4808c.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/zedipulegoxeto.pdfIn PDF document text
    • https://tuzuwopibas.weebly.com/uploads/1/3/4/3/134316447/31a9057.pdfIn PDF document text
    • https://rusekawavupor.weebly.com/uploads/1/3/4/0/134096427/dizefavorolomim.pdfIn PDF document text
    • https://kofenamuw.weebly.com/uploads/1/3/4/9/134900453/ruforuvifim.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/xelagesavutefu.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/2dd0f984841cd.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/babuxufarizuxur/vokivakamizisapukekutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8eda4161-9d72-4c6c-a0ca-2cfe012834bb/nofakalamukonirolodetawa.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/45046417025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78168d2f-edb6-4e14-b5f7-285b2414e9b0/wosaxufexexexuxov.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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 5300 bytes
SHA-256: 2bec1c8209f234dded3a7b9d2b58adf4dd19403684574f054c91128a261374e1
font_01_sfnt_off0000c5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A7 10284 bytes
SHA-256: 7b06d5d8eef53ab1b9e931b8ac0326a2bb5ab4fc408b38e3947519bb40177e96

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