Malicious PDF — malware analysis report

Static analysis result for SHA-256 78c65a022b218b74…

MALICIOUS

PDF

74.1 KB Created: 2021-06-11 03:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8777d4d930f3cdbe1a191dafec9c0b5f SHA-1: 5161c6975da0532ad4bd102e5dee6b517e78816b SHA-256: 78c65a022b218b746e66e968ba8a83953aee57fe968f983eaf3adbcd56ba3efb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to drive traffic to malicious sites. One prominent URL, 'https://infrive.ru/pbw?utm_term=free+download+minecraft+java+edition+android', suggests a lure for downloading a game. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://infrive.ru/pbw?utm_term=free+download+minecraft+java+edition+android PDF link annotation
    • https://xuvitekopa.weebly.com/uploads/1/3/2/7/132712193/kidopopaxejom.pdfIn PDF document text
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/filumujimilodijiresa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5ff39c31ae3a4.pdfIn PDF document text
    • https://xuwudivalef.weebly.com/uploads/1/3/4/8/134889087/bcdf8919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493579/normal_60614f618ae4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419644/normal_5fe09629891ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_60600b87154bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485162/normal_600ce18c8620f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465702/normal_60b7507073478.pdfIn PDF document text
    • https://ruzuxopamekegi.weebly.com/uploads/1/3/4/7/134748505/f59a7b.pdfIn PDF document text
    • https://kirenokasanav.weebly.com/uploads/1/3/4/4/134445236/jiwobaxedel_jumasaxefa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5ff684a019646.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456671/normal_5fe251a1240cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463830/normal_60c0f2900362b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5fcf7201ef0b2.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4443594/normal_60b1c3ff89ce8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5ff1cf3369da6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_6031cf55c1a0a.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_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 5172 bytes
SHA-256: 0d388571221154eff7b86ee5533fb0691f4c11d1926573c040d7b929de3a8ebe
font_01_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 11056 bytes
SHA-256: 14756ebb2b1c983e6be2cda11a900e07e6023e32453861f76bd305b975f65c9c

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