Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b4185c2a73cfd0…

MALICIOUS

PDF

42.1 KB Created: 2020-06-03 14:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 5d543fcc54c68429e6a462628c8d91ad SHA-1: 9c87ef6f95d4c832c7ebe624d7f2791ffdeff5f3 SHA-256: e5b4185c2a73cfd04bfed50f7d13cfc2db789db51453b87f1aba68ad4d9a129e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm or SEO abuse tactic. One of the embedded links, 'http://sierraunfiltered.com/uploads/1/3/0/6/130639706/130639706.html#carving+wood+spirits+pdf', suggests a lure related to 'carving wood spirits'. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests malicious intent through link manipulation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://sierraunfiltered.com/uploads/1/3/0/6/130639706/130639706.html#carving+wood+spirits+pdf PDF link annotation
    • http://justmunchies.co.uk/uploads/1/3/1/6/131606494/derigikakapabikuwudi.pdfIn PDF document text
    • http://sophiereligionproject.com/uploads/1/3/0/6/130605166/geraziwefikemu.pdfIn PDF document text
    • http://buypioglitazone30mgonsale.greatwebsitebuilder.com/uploads/1/3/1/4/131454415/lonaremogasisenitixa.pdfIn PDF document text
    • http://membership-netfrix.com/uploads/1/3/0/4/130483703/efde3f7.pdfIn PDF document text
    • http://heavenlyvapesco.com/uploads/1/3/0/2/130287428/7952e84104aa49f.pdfIn PDF document text
    • http://johanneslavertonrestaurant.com/uploads/1/3/0/4/130483429/forikazim.pdfIn PDF document text
    • http://idiaridellataunus.com/uploads/1/3/0/2/130289702/felinab-bupeji.pdfIn PDF document text
    • http://admin.mosaicasd.com/uploads/1/3/1/3/131398254/2ac3d85ca2.pdfIn PDF document text
    • http://beta.dayafoundation.org/uploads/1/3/1/4/131409861/5367166.pdfIn PDF document text
    • http://webmail.grinandgrowchildcare.org/uploads/1/3/1/4/131438474/wubefifinudagivonur.pdfIn PDF document text
    • http://sierraunfiltered.com/uploads/1/3/0/6/130639706/terms.htmlIn PDF document text
    • http://sierraunfiltered.com/uploads/1/3/0/6/130639706/dmca.htmlIn PDF document text
    • http://sierraunfiltered.com/uploads/1/3/0/6/130639706/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sudevoxe.files.wordpress.com/2020/05/32134594428.pdfIn PDF document text
    • https://borafitafule.files.wordpress.com/2020/05/46449308887.pdfIn PDF document text
    • https://magapabiv.files.wordpress.com/2020/05/86946083582.pdfIn PDF document text
    • https://nowapumibugi.files.wordpress.com/2020/06/94107125592.pdfIn 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 3

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7968 10388 bytes
SHA-256: 04241347f61be6c848e40a064f6bb3332dbdc3f4d4c7f4af0bf9bbefa90bb2bc

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