Malicious PDF — malware analysis report

Static analysis result for SHA-256 8813ee20604aadc0…

MALICIOUS

PDF

34.4 KB Created: 2020-06-23 08:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c36878a20c970f35ecefb0de438dbd2 SHA-1: 0b42d1f59416f97f9bebfc931ad4326e9742f83d SHA-256: 8813ee20604aadc0adeea48549696e1204b454c5cd31f304da27b27132b107d9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external websites, many of which host further PDF files. This suggests a link farm or redirection scheme designed to lead users to a network of malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a large number of external links supports this assessment.

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://poketanque.com/uploads/1/3/2/6/132683165/132683165.html#pro+com+heater+manual
    • http://ecct1868.org/uploads/1/3/0/4/130483409/e4ed8037866.pdf
    • http://mx.kaunited.org/uploads/1/3/0/3/130313054/9368122.pdf
    • http://mta-sts.jenmalibu.com/uploads/1/3/1/8/131856170/bakejuraxefoxujovuzi.pdf
    • http://aitparking.com/uploads/1/3/0/2/130288861/6667561.pdf
    • http://acornjewels.lynn-gustafson.com/uploads/1/3/1/1/131164383/birowaxegavosodiviv.pdf
    • http://zhl.brdge.org/uploads/1/3/0/3/130379824/zavofeletogovi.pdf
    • http://essgeebeauty.co.uk/uploads/1/3/0/2/130271023/1ceff5517c.pdf
    • http://peinture-sculpture-gravure.com/uploads/1/3/1/4/131406049/6987427.pdf
    • http://cpanel.sweetsbymaddie.com/uploads/1/3/1/3/131383042/5878374.pdf
    • http://venturetize.com/uploads/1/3/1/1/131164016/9403623.pdf
    • http://cherrychase.preview.pethealthnetworkpro.com/uploads/1/3/0/5/130543173/tutugekufap.pdf
    • http://mta-sts.diradjafm.com/uploads/1/3/0/2/130272640/ratibo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a29.bin
9ab1bf60747b0841281c3db9b022d34d8bf3fbce5983350f85fed17557013392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A29 4696 bytes
font_01_sfnt_off000059e2.bin
ca8c335e0a2e278b538bf34c64273d4c5527ada1caf2b11e08427873a2ec7378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E2 10280 bytes

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