Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd4ff7d26cbe3f1…

MALICIOUS

PDF

68.7 KB Created: 2021-05-20 01:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 140fe383d2e7bf2c1460ba1342b9877d SHA-1: 3d2069213c0825ed9fe02ea7abf94b07a1de80e7 SHA-256: 9cd4ff7d26cbe3f19180ce41a80ef1fab5c6182cc2cfe78a71d2e94cc780692f
156 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 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://baarspo.ru/strik?utm_term=akilli+defter+indir+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501996/normal_5fcb1d68f2904.pdfIn PDF document text
    • https://moworanapubo.weebly.com/uploads/1/3/4/6/134685821/fazalokeg.pdfIn PDF document text
    • https://wigadanoj.weebly.com/uploads/1/3/4/4/134404864/puzowar-lixuf.pdfIn PDF document text
    • https://wulukapuw.weebly.com/uploads/1/3/0/7/130740123/nilijogeviwak.pdfIn PDF document text
    • https://rilawexiretik.weebly.com/uploads/1/3/4/2/134267086/kidawose-topikupex-gilozadanex.pdfIn PDF document text
    • https://vaniselati.weebly.com/uploads/1/3/5/2/135293279/lilifebap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460055/normal_6037064e305e3.pdfIn PDF document text
    • https://lunejuwibamir.weebly.com/uploads/1/3/4/5/134587588/b8053.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_604f680add4ed.pdfIn PDF document text
    • https://devatokur.weebly.com/uploads/1/3/2/6/132683056/0c32c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416132/normal_5ff57b106a1ce.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/c7698bf2-779b-483b-9b85-eec1d32271be/crazy_love_lyrics_beyonce.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/pamadirevejagufa.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/34429161852.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/66313314122.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/40225212754.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/86120044819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bfb578f-9a87-4358-bb9c-4fd2b170debc/the_magic_school_bus_characters_age.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/jidiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/medical_certificate_format_for_belgium_visa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3424e51f-33f4-499a-9b3e-4ba1692f6674/fokiwofo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a0987b-fe82-4d3f-ab6c-d887df77cc74/soxam.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_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 4700 bytes
SHA-256: ed11d779dcdfd82f4fc2d5d14d793b62c9e7bdde277cfe9f4d2db4fa0e87929c
font_01_sfnt_off0000dfa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA1 11652 bytes
SHA-256: 50c066e47f266404512fc26a7e863e1905ada49cebeb2f75aac694263c0ea9f4

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