Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3936448ba4de35…

MALICIOUS

PDF

73.1 KB Created: 2021-01-31 12:44:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 821985c35dc666500ce1e2f7f4a0c2d1 SHA-1: c075952993538a6f60ff795bb10a32c66db30486 SHA-256: 1a3936448ba4de3582c3c10fb8935c57cf90d38d45b63cf5f5a9abe5db9b6edc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded external links, suggesting it functions as a link farm or phishing lure. The primary purpose appears to be directing users to various external PDF documents hosted on services like weebly.com and s123-cdn-static.com, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wb?keyword=yu%20gi%20oh%20duel%20links%20top%20decks%202019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff46de62c8da.pdfIn PDF document text
    • https://wutaleba.weebly.com/uploads/1/3/5/3/135390467/bufejogepi.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/59daadc9397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_6015e1e5769e7.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/kivasajamafedobo.pdfIn PDF document text
    • https://witetalujoloxof.weebly.com/uploads/1/3/0/7/130740434/losegijosux-rabugipil-lonufi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_60143e0b50326.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_60067fbd639f9.pdfIn PDF document text
    • http://vknart.xyz/59413169808nz7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488560/normal_5fe09a051ff34.pdfIn PDF document text
    • http://dreabling.online/brain_break_activities_ks2bdtkf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392658/normal_5fcd9c0636d13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493245/normal_5fcaf76998a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_5fe9ea81236bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464709/normal_5fec2f9b2e0e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474727/normal_5fe108ebdd8b1.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_off0000de6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6A 5536 bytes
SHA-256: dd60481ba437acdbe3980f26407fa9ceee3f79c46de2d2697f52515fac71ae13
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 11792 bytes
SHA-256: e7a30bb2bca5d7fe6d4dc19568badc60f880b3170e314cf5be7a2cd9e78b7231

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