Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd97749c592b416…

MALICIOUS

PDF

31.7 KB Created: 2020-03-11 09:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a3de0419e752d341c2fef3fc624e22c SHA-1: de370dd5f2b23e3d68738bdc6334782876c6a708 SHA-256: 1dd97749c592b4163fb0dded8d60bcd455d05d3e4d8fafe784b5a13ca5fb9839
94 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a technique often used for SEO poisoning or distributing further malicious content. The document body, though heavily obfuscated, contains references to URLs and appears to be a lure for a chemistry worksheet answer key. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://2psb9.slpny.com/uploads/1/3/0/7/130739269/130739269.html#conjugate+acid+base+pairs+chem+worksheet+19-2+answer+key
    • http://estacao63.com/uploads/1/3/1/0/131069874/5697516.pdf
    • http://allegorieco.com/uploads/1/3/0/7/130739582/nubasugus.pdf
    • http://chloedo.com/uploads/1/3/0/4/130476351/38d96e08e0369.pdf
    • http://redmountaincut.com/uploads/1/3/0/5/130588589/wonariwowibagi.pdf
    • http://hostmaster.chalettaste.be/uploads/1/3/0/3/130323214/pufowetijo.pdf
    • http://74-123-76-26.mgwnet.com/uploads/1/3/0/6/130620797/1920.pdf
    • http://thesouthernsigns.com/uploads/1/3/0/7/130739015/loxixa_pivanuwusof_mojiratej.pdf
    • http://onlygodcanjudgeus.com/uploads/1/3/0/3/130324005/7a24b7642807289.pdf
    • http://pawsandpuzzles.org/uploads/1/3/0/5/130588206/8653053.pdf
    • http://nongress.com/uploads/1/3/0/6/130620283/d65527c0.pdf
    • http://rayofsunshine-hh.com/uploads/1/3/0/9/130969439/5136690.pdf
    • http://bartdegreef.com/uploads/1/3/0/7/130739309/6635577.pdf
    • http://andrewjones.io/uploads/1/3/0/4/130436197/sevemupi.pdf
    • http://avikat.com/uploads/1/3/0/2/130272384/wadikog-liwogoz-faziliwe-xalovi.pdf
    • http://yhazclothes.com/uploads/1/3/0/9/130969678/wozabusuzalozavak.pdf
    • http://wijbereikengroningen.nl/uploads/1/3/0/2/130289379/7022057.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058c4.bin
a54add0fb054ed0dd67a9ff5c02b768d8cc21dd32d9e001ea4a448163f361e55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C4 6044 bytes

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