Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1a0569d2bf5077…

MALICIOUS

PDF

49.9 KB Created: 2020-05-21 19:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 0880a4356c7e96aa6f6d1ff1d729476f SHA-1: 59d8403e7edfef173dca14e2a9a99e64527cdd02 SHA-256: 2a1a0569d2bf50778d5c0547b24a5a033041d192b2eddc7c35be649e030b3b94
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains a large number of external links, identified as a PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to 'Ncoer form pdf' and the authoring application 'wkhtmltopdf', suggesting a lure for users to access these external resources. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a link farm or SEO spam campaign designed to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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 http://angelsinstyle.shop/uploads/1/3/0/6/130605289/130605289.html#ncoer+form+pdf PDF link annotation
    • http://facilecasa.net/uploads/1/3/1/3/131384333/lonagukekomofeji.pdfIn PDF document text
    • http://4wheelsformeals.com/uploads/1/3/0/5/130540037/negus.pdfIn PDF document text
    • http://thatchong.com/uploads/1/3/1/4/131438622/dafuxeteb-mugekudikikaji.pdfIn PDF document text
    • http://3vmarketing.com/uploads/1/3/0/4/130483647/6829340.pdfIn PDF document text
    • http://monkey84.com/uploads/1/3/0/2/130288448/c1c22bc9c.pdfIn PDF document text
    • http://noordzeebanket.com/uploads/1/3/0/2/130272577/vuzawuraxomulof-bunaneris.pdfIn PDF document text
    • http://renewyoucancertologyuk.com/uploads/1/3/1/4/131453301/4f7ebbdd9d.pdfIn PDF document text
    • http://browistryandglow.com/uploads/1/3/0/9/130969800/d98927fec.pdfIn PDF document text
    • http://mattinablue.com/uploads/1/3/1/0/131070115/wavori.pdfIn PDF document text
    • http://dogmaanimalrescue.com/uploads/1/3/0/4/130478163/921521d809.pdfIn PDF document text
    • http://intelligenceforinnovation.net/uploads/1/3/1/4/131483307/33689acc9ae.pdfIn PDF document text
    • http://brauchconsumerlaw.com/uploads/1/3/1/6/131637719/5045485.pdfIn PDF document text
    • http://bookkeepingsolutionsonline.com/uploads/1/3/0/6/130604650/591764.pdfIn PDF document text
    • http://rowlandleadership.com/uploads/1/3/0/5/130539756/jepibifivegefe-xiluxovota.pdfIn PDF document text
    • http://themontsd.com/uploads/1/3/1/3/131380901/fcb7ddb8b8cf3.pdfIn PDF document text
    • http://smithvetservices.com/uploads/1/3/1/4/131437477/zabulega-bogimug-sudap-sudofewuzesixuz.pdfIn PDF document text
    • http://drainagecleaner.com/uploads/1/3/0/4/130483799/5679402.pdfIn PDF document text
    • http://topcoatpainter.com/uploads/1/3/0/5/130539465/pelozafozotet.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F56 1528 bytes
SHA-256: 2d84ae0636942eb5063defe9e2f34a76032a15a437a22af272f09e81a5429577
font_01_sfnt_off00009718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9718 10872 bytes
SHA-256: 960d0a0cec66fbb76fa4ec235da65fac78259d19f53157c80a461adb5504da8b

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