Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce25f0085b605d95…

MALICIOUS

PDF

74.2 KB Created: 2021-05-30 06:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 5bd9ef38299a3531b127c9547a31bd06 SHA-1: 513eb8d7282159c56d8144a69c39b03607099cc7 SHA-256: ce25f0085b605d95c0b0ccb5892fc4a4f7ac9476bcf56d772e040095d2a5f523
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://mezovuduw.ru/123?utm_term=subject+and+predicate+worksheet+for+grade+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381756/normal_604548be2a93b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496204/normal_600861a02cd4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383807/normal_5ff763b729e79.pdfIn PDF document text
    • https://puzagejezazi.weebly.com/uploads/1/3/4/4/134465952/7d1e6b05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459654/normal_5fde7fed81922.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385614/normal_6009330fdaf82.pdfIn PDF document text
    • https://pipulelinukebe.weebly.com/uploads/1/3/4/3/134364851/3863290.pdfIn PDF document text
    • https://wusukinepazewa.weebly.com/uploads/1/3/4/3/134372908/2993218.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/rumexujovidud-jusiwudovonu-tebenusobigej-kobogeminu.pdfIn PDF document text
    • https://lirowutezi.weebly.com/uploads/1/3/4/6/134696369/velerofawuzuropozo.pdfIn PDF document text
    • https://kisuwirabavaruz.weebly.com/uploads/1/3/3/9/133999170/0e1f8348.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/d448faf45b.pdfIn PDF document text
    • https://sinofokum.weebly.com/uploads/1/3/5/3/135316266/jerowuvukejemib.pdfIn PDF document text
    • https://tojoxiwumo.weebly.com/uploads/1/3/4/3/134319360/xarewekaralavemoze.pdfIn PDF document text
    • https://wapofowivukixog.weebly.com/uploads/1/3/4/0/134017250/5977444.pdfIn PDF document text
    • https://dunopugagikevu.weebly.com/uploads/1/3/4/7/134728147/1506227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_603122b5b76d5.pdfIn PDF document text
    • https://zedumolubu.weebly.com/uploads/1/3/4/8/134862080/0a92b0c4.pdfIn PDF document text
    • https://vegilumos.weebly.com/uploads/1/3/1/3/131383621/bazixaxuzolu-vudamasazorul-xavubexawura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388156/normal_5fdf64a09045f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5ff5f9c65c4c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_601cb15515687.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 5948 bytes
SHA-256: 745aab11dd1ff8a15348256b27d6f3e789210f6b7addd21145eec38aefe87f4b
font_01_sfnt_off0000f888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF888 10200 bytes
SHA-256: 52df4c23daa7a5de17fe72af0f62506266e2765b7af744c22d1390a675b59959

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