Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b48a99d10f4deb…

MALICIOUS

PDF

42.6 KB Created: 2020-05-16 09:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 0c752721b2373be303e64a1954f8ad7f SHA-1: d5535f5d3f477abf4d805ed956574bd21dacc3a9 SHA-256: 84b48a99d10f4deb4d8c3103a39281f5c11835464a72c49b99ade2396c6b202d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic further supports a malicious intent to trick the user into downloading a payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://naturaltolife.com/uploads/1/3/0/6/130604048/130604048.html#cid+new+video++mp4 PDF link annotation
    • http://siouxcityhp.org/uploads/1/3/1/8/131856664/b24013fbe7555c7.pdfIn PDF document text
    • http://digitalcandids.com/uploads/1/3/0/7/130739492/xujinojot-migizupezu.pdfIn PDF document text
    • http://graffitigreek.com/uploads/1/3/0/7/130776616/milarowimuxumo_vupetofumob_lujinapanipadi_zuvuvisazilewu.pdfIn PDF document text
    • http://schellereyecare.com/uploads/1/3/0/5/130543064/zunegapiva-mijokada-jubuvibenaki.pdfIn PDF document text
    • http://montril.com/uploads/1/3/0/6/130604348/4753879.pdfIn PDF document text
    • http://bunya.shop/uploads/1/3/0/8/130874668/780a1c6390049.pdfIn PDF document text
    • http://thechronicvet.com/uploads/1/3/1/4/131483584/1f1762b765.pdfIn PDF document text
    • http://jfepipe.com/uploads/1/3/0/6/130604902/956669.pdfIn PDF document text
    • http://zerodarkcoffeecompany.com/uploads/1/3/0/5/130590511/vabotaveme.pdfIn PDF document text
    • http://sundayswithshelly.com/uploads/1/3/0/2/130271132/b9f8daa475e6ccf.pdfIn PDF document text
    • http://smileytolson.net/uploads/1/3/0/3/130379317/9248390.pdfIn PDF document text
    • http://portlandallergyclinic.net/uploads/1/3/1/3/131383650/vupizes.pdfIn PDF document text
    • http://galavisconsulting.com/uploads/1/3/0/7/130776454/fanakupulasexi.pdfIn PDF document text
    • http://philippinepickleball.shop/uploads/1/3/0/4/130488983/degipozopujilitomad.pdfIn PDF document text
    • http://kristynlanggundlach.com/uploads/1/3/0/8/130813762/42786ef91a7d67.pdfIn PDF document text
    • http://drdeborahbarbiere.com/uploads/1/3/0/4/130436140/ed5086c1513896d.pdfIn PDF document text
    • http://shirelgidekel.com/uploads/1/3/0/4/130483114/7682394.pdfIn PDF document text
    • http://parrishnaturals.com/uploads/1/3/1/6/131637136/jukezow.pdfIn PDF document text
    • http://philippemora.net/uploads/1/3/0/7/130739878/vajivonepawone.pdfIn PDF document text
    • http://hgoadventure.com/uploads/1/3/0/6/130605165/b5fbf3f.pdfIn PDF document text
    • http://morealestatebook.com/uploads/1/3/1/1/131163854/7029009.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_off00006919.bin
19dc0414caa73bc5b3a98b0169f5065f594a635e31c331edfc8866013786b8a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6919 5220 bytes
font_01_sfnt_off00007b29.bin
ef34d00a8474329ef658e75ce98fd01a76665d8c29cedd7b98a274adecd454b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 10284 bytes

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